SI23149A - Nove benzatinske soli ACE inhibitorjev, postopek za njihovo pripravo in njihova uporaba za zdravljenje kardiovaskularnih bolezni - Google Patents
Nove benzatinske soli ACE inhibitorjev, postopek za njihovo pripravo in njihova uporaba za zdravljenje kardiovaskularnih bolezni Download PDFInfo
- Publication number
- SI23149A SI23149A SI200900255A SI200900255A SI23149A SI 23149 A SI23149 A SI 23149A SI 200900255 A SI200900255 A SI 200900255A SI 200900255 A SI200900255 A SI 200900255A SI 23149 A SI23149 A SI 23149A
- Authority
- SI
- Slovenia
- Prior art keywords
- benzatin
- salt
- ace
- salts
- perindopril
- Prior art date
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- 239000005541 ACE inhibitor Substances 0.000 title claims abstract description 39
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Abstract
PredloĹľeni izum opisuje nove soli ACE inhibitorjev z N,N'-dibenziletilendiaminom (okr.: benzatinske soli), postopek za njihovo pripravo v kristalni in amorfni obliki z reakcijo dveh molov ACE inhibitorja in enega mola N,N'-dibenziletilendiamina, postopek za pripravo farmacevtskih formulacij, ki vsebujejo te soli in njihovo uporabo za zdravljenje kardiovaskularnih bolezni.
Description
Nove benzatinske soli ACE inhibitorjev, postopek za njihovo pripravo in njihova uporaba za zdravljenje kardiovaskularnih bolezni.
Področje tehnike, v katero spada izum.
Predloženi izum je s področja farmacevtske kemije in se nanaša na nove, stabilne soli ACE inhibitorjev z Ν,Ν'-dibenziletilendiaminom v amorfni in kristalni obliki, s splošno formulo:
ACE . HN-CH2CH2-NH . ACE I I
CH2CeH5 CH2CeH5 kjer ACE pomeni molekulo ACE inhibitorja, postopek za njihovo pripravo in njihovo uporabo za izdelavo farmacevtske oblike za zdravljenje kardiovaskularnih bolezni povezanih z zvišanim krvnim pritiskom.
Tehnični problem.
Pri praktični uporabi do sedaj znanih soli ACE inhibitorjev se večkrat srečamo z nezadostno stabilnostjo farmacevtskih pripravkov. Zlasti izrazit primer so pripravki, ki vsebujejo perindopril erbumin in se ravno iz tega razloga v zadnjem času opuščajo. Zato obstaja potreba po novih soleh z boljšo stabilnostjo tako, da bodo izdelani farmacevtski pripravki uporabni tudi v deželah s povprečno višjo dnevno temperaturo in povečano zračno vlažnostjo z dovolj dolgim rokom trajanja.
Stanje tehnike.
ACE inhibitorji (okr.: Angiotensin Converting Enzyme) so zelo uporabni za zdravljenje kardiovaskularnih bolezni, posebej v zvezi s povišanim krvnim pritiskom in oslabljenim delovanjem srca. Znanih je cela vrsta ACE inhibitorjev kot na primer: enalapril, kinapril, perindopril, trandolapril, ramipril, fosinopril, spirapril, moexipril, lizinopril, cilazapril in
Za izdelavo farmacevtske oblike, primerne za aplikacijo, se uporabljajo lahko v osnovni obliki (prosta kislina), kot hidrat, večinoma pa v obliki ustreznih soli, predvsem zaradi boljše topnosti v vodi.
Enalapril se uporablja v obliki maleata, ki je opisan v patentu US 4,374.829 ali kot natrijeva sol opisana v patentu Sl 9111842.
Perindopril je običajno sol z terc. butilaminom (erbumin) in sicer v različnih polimorfnih kristalnih oblikah: alfa, beta, gama, delta, epsilon, eta in D, opisanih v patentih EPA0308341, EP 1.296.947B1, EP 1,294.689A1, EP 1,296.948, WO 2007/02009A1, kot erbumin v hidratizirani obliki opisan v patentih EP 1,647.547 in WO 2004/46172 ter kot sol z amino kislino arginin v EP 1,354.873.
Perindopril, pa tudi drugi ACE inhibitorji se često kombinirajo z diuretiki, na primer z hidroklorotiazidom, indapamidom in drugimi , kot je opisano v prijavi WO 2007/099217A1.
Ramipril, pridobljen po patentih EP 0097022 in US 6,541.635 je znan v obliki kisline, hidroklorida in v drugih soleh, na primer z alkalijskimi in zemljoalkalijskimi kovinami kot z natrijem, kalijem ali kalcijem (USPTO 20070098782). Cinkove soli so znane iz patentne prijave WO 2008/065421, prav tako tudi kombinacija z diuretiki, statini, antidiabetiki itd.
Patentna prijava WO 2008/065424 obravnava zanimivo sol ramiprila z amlodipinom, ki naj bi se uporabljala za preprečevanje kardiovaskularnih nepravilnosti, odpoved ledvic, ishemična stanja, diabetes melitus in stanje po kapi.
Patent US 6,086.919 obravnava kombinacijo ramiprila z dihidropiridinskimi spojinami kot so nifedipin, nitrendipin in lacidipin.
Cilazapril je največkrat v obliki hidrata in se zaradi občutljivosti formulira s suho granulacijo kot opisuje patent EP 1,603.916, tudi v kombinaciji z diuretiki po patentu EP 1,889.629.
Fosinopril vsebuje v molekuli fosfor in se uporablja v obliki natrijeve soli, EP 0408273 in US 7,078.532, pa tudi kot kalcijeva ali cinkova sol in v različnih polimorfnih oblikah kot opisuje evropska patentna prijava EP 0442378B1.
Glavni problem pri večini ACE inhibitorjev je relativno slaba stabilnost spojin. Pojavlja se več kemijskih reakcij, ki vodijo v razkroj molekule, nastanek novih nečistoč in zmanjšanje aktivnosti. Vsekakor je na prvem mestu odcepitev vode, ki ji sledi interna ciklizacija in tvorba diketopiperazinskih nečistoč. Diketopiperazinske spojine so neaktivne in zmanjšujejo učinkovitost osnovne spojine.
Druga nezaželjena reakcija je hidrolitski odcep esterske skupine, da nastane dikarboksilna kislina, na primer ramiprilat ali perindoprilat. To so spojine, ki so nekajkrat bolj aktivne od osnovne spojine, vendar se težje transportirajo v organizmu. Razcep esterske vezi pospešujejo močno bazični ioni in višja vsebnost vode v preparatu, v organizmu pa encimi esteraze.
Problem stabilnosti se največkrat rešuje z natančno izdelanimi načini priprave farmacevtske oblike, granuliranje (suho ali mokro) , pa tudi z raznimi dodatki za povečanje stabilnosti. Pri perindopril erbuminu se pogosto dodajajo bikarbonati ali karbonati alkalijskih in zemljoalkalijskih kovin (US 2003/0215526A1).
Seveda stabilnost farmacevtskega pripravka z ACE inhibitorji močno zavisi tudi od osnovne stabilnosti soli v kateri je ACE inhibitor. V slučaju perindoprila vemo, da so druge soli kot na primer kalcijeva, natrijeva ali argininijeva sol bistveno bolj stabilne kot erbumin.
Opis rešitve tehničnega problema.
Glavni tehnični problem povezan s stabilnostjo ACE inhibitorjev in njihovih soli rešujemo na več načinov. V glavnem pa moramo preprečevati hidrolizo esterske skupine in interno ciklizacijo do diketopiperazinskih produktov. Na to lahko vplivamo z izbiro ustreznega kationa soli, s steričnimi razmerami v soli, z izbiro ustreznih inertnih dodatkov, nujnih pri pripravi granulata za tabletiranje, z raznimi sekundarnimi dodatki za povečanje stabilnosti in z načinom priprave farmacevtske oblike.
Na primeru perindopril erbumina se je izkazalo, da je terc. butilamin, ki je komponenta adicijske soli, relativno šibko vezan. Po odcepitvi terc. butilamina iz soli nastane prosta perindopril kislina, ki je zelo dovzetna za nukleofilni napad in interno ciklizacijo. To se lahko delno rešuje s tvorbo ionske soli, na primer s kationi kalija, natrija ali kalcija, kot je opisano v patentni prijavi WO 2008/150245A2.
Konformacijska analiza strukture soli perindoprila z 1 H-NMR spektroskopijo je pokazala, da molekula obstoji v cis in trans obliki. Trans oblika je bolj navzoča pri perindopril erbuminu. Značilno pa je, da je ravno v cis konformeri navzoča intermolekularna tvorba vodikove vezi med karboksilatno skupino in NH skupino, kar v znatni meri molekulo stabilizira! Presenetljiva je bila naslednja ugotovitev, da je pri soleh ACE inhibitorjev z Ν,Ν'-dibenziletilendiaminom (okr. benzatin) v splošnem večji delež cis konformere, kar je tudi razlog za večjo stabilnost sintetiziranih benzatinskih soli ACE inhibitorjev.
Drug možen razlog za slabšo stabilnost nekaterih soli ACE inhibitorjev je hidroliza esterske vezi. Pospešena je pri višji vsebnosti vode , višji temperaturi in navzočnosti močno bazično delujoče snovi, na primer terc. butilamina ali Na ionov. Tudi s tega aspekta je izbira Ν,Ν'-dibenziletilendiamina kot komponente soli zelo primerna.
Predmet našega izuma so soli ACE inhibitorjev z Ν,Ν'-dibenziletilendiaminom (okr.: benzatin) s splošno formulo:
ACE . HN-CH2CH2-NH . ACE I I
CH2C6H5 CH2C6H5 kjer je molsko razmerje ACE inhibitorja proti benzatinu 2:1.
Prednosti benzatinskih soli ACE inhibitorjev so naslednje:
- soli posedujejo zelo dobro stabilnost pri staranju, ker hidrolize esterske skupine in tvorbe diketopiperazinskih nečistoč skoraj ni;
- soli odlično kristalizirajo iz običajnih topil in nekatere celo iz vode;
- pri kristalizaciji se produkt zelo dobro očisti sinteznih primesi in dobimo zelo čiste učinkovine;
- kristalizirane spojine imajo višje tališče od amorfnih in jih tudi prekašajo v obstojnosti;
- benzatin je netoksična komponenta in je dobro znan s področja penicilinskih antibiotikov.
Benzatinske soli ACE inhibitorjev sicer lahko pripravimo tudi v amorfni obliki, če raztopine soli zamrznemo in nato liofiliziramo. Izkoristki sinteze so višji, vendar so soli nekoliko manj čiste.
V smislu izuma pripravljamo benzatinske soli ACE inhibitorjev z reakcijo obeh komponent v molskem razmerju: 2 mola ACE inhibitorja v obliki proste kisline na 1 mol benzatina in kristalizacijo v primernih topilih, definiranih za vsak primer posebej. Izjemoma lahko pridobimo benzatin perindopril tudi z mokro granulacijo tako, da na inertne komponente - sestavine mase za granuliranje - pršimo raztopino perindopril erbumina in benzatina ter sušimo v protitoku toplega zraka. Pri tem odhlapi terc. butilamin, na granulatu pa ostane vključen benzatin perindopril. Granulat nato tabletiramo.
Kot izhodno snov za pripravo benzatinskih soli ACE inhibitorjev uporabimo ACE inhibitor v obliki proste kisline, hidrata ali v obliki soli s hlapno bazično komponento, kot že omenjeni perindopril erbumin.
Kristalizacija je zelo selektivna tako, da lahko uporabimo tudi izhodno snov slabše kvalitete, na primer tudi z 10% diketopiperazinske nečistoče, pa kljub temu dobimo produkt visoke čistosti. Diketopiperazinska nečistoča namreč nima proste karboksilne skupine in zato ne kristalizira z benzatinom in se odstrani z matično lužnico kristalizacije.
Navedena metoda je splošno uporabna za pripravo benzatinskih soli vseh znanih ACE inhibitorjev, ki imajo prosto karboksilno skupino in ni omejena samo na konkretno navedene primere ACE inhibitorjev.
Kristalno strukturo spojin smo določali z rentgenskimi praškovnimi difraktogrami (okr.: XRD), posnetimi na rentgenskem difraktometru X'Pert PRO z alfa konfiguracijo, sevanjem CuKa, v območju od 3 do 35° 2-theta. FTIR spektre smo posneli z IR spektrometrom Perkin Elmer 727B.
Benzatinsko sol perindoprila (okr. benzatin perindopril) dobimo z reakcijo perindoprila in benzatina v molskem razmerju 2:1 in kristalizacijo iz vročega etilacetata ali iz vode v polimorfni obliki A z značilnim rentgenskim praškovnim difraktogramom, prikazanim v tabeli 1. Pri tem so navedeni samo signali višji od 15% relativne intenzitete.
Tabela 1.
| No. | Položaj [° 2 theta] | Razdalja d [ A ] | Relat. intenziteta [ % ] |
| 1 | 5,8949 | 14,98041 | 25,01 |
| 2 | 6,5122 | 13,56185 | 100,00 |
| 3 | 10,7061 | 8,25681 | 24,99 |
| 4 | 12,0797 | 7,32081 | 17,38 |
| 5 | 14,8462 | 5,96227 | 20,12 |
| Tabela 1, 6 | nadaljevanje: 16,0810 | 5,50712 | 18,65 |
| 7 | 16,6625 | 5,31622 | 24,27 |
| 8 | 17,6098 | 5,03231 | 17,22 |
| 9 | 17,8417 | 4,96743 | 45,19 |
| 10 | 19,0928 | 4,64466 | 47,09 |
| 11 | 15,5830 | 4,52949 | 32,66 |
| 12 | 20,5267 | 4,32333 | 18,58 |
| 13 | 21,3166 | 4,16487 | 31,09 |
| 14 | 21,4948 | 4,13075 | 20,08 |
| 15 | 22,0069 | 4,03576 | 28,04 |
| 16 | 22,6724 | 3,91880 | 15,78 |
| 17 | 23,9340 | 3,71500 | 43,77 |
| 18 | 25,0831 | 3,54736 | 18,66 |
| 19 | 25,5437 | 3,48442 | 16,50 |
| 20 | 28,1560 | 3,16680 | 18,30 |
| 21 | 29,6824 | 3,00733 | 28,99 |
| 22 | 35,0811 | 2,55590 | 20,18 |
Benzatin perindopril v polimorfni obliki B dobimo z reakcijo perindoprila in benzatina v molskem razmerju 2:1 in kristalizacijo iz etanola po dodatku metil-terc.butiletra. Ima značilen rentgenski praškovni difraktogram prikazan v tabeli 2, kjer so navedeni samo signali z relat. intenziteto več kot 10%.
| Tabela 2. | |||
| No. | Položaj [° 2 theta] | Razdalja d [ A j | Relat. intenziteta [ % ] |
| 1 | 6,5142 | 13,55760 | 100,00 |
| 2 | 11,5531 | 7,65333 | 28,99 |
| 3 | 12,1045 | 7,30591 | 15,95 |
| 4 | 14,8847 | 5,94695 | 14,10 |
| 5 | 16,0939 | 5,50275 | 13,61 |
| 6 | 17,6270 | 5,02743 | 13,85 |
| 7 | 19,6125 | 4,52273 | 47,32 |
| 8 | 20,1330 | 4,40696 | 14,26 |
| 9 | 20,5802 | 4,31221 | 23,59 |
| 10 | 20,4838 | 4,13283 | 10,67 |
| 11 | 22,0327 | 4,03110 | 22,73 |
| 12 | 23,1710 | 3,83558 | 21,40 |
| 13 | 24,0011 | 3,70477 | 26,78 |
| 14 | 26,1996 | 3,39866 | 11,24 |
| 15 | 26,6917 | 3,00640 | 14,75 |
| 16 | 30,5506 | 2,92381 | 12,96 |
| 17 | 36,6578 | 2,44950 | 13,62 |
Benzatinsko sol fosinoprila (benzatin fosinopril) dobimo z reakcijo fosinoprila in benzatina v molskem razmerju 2:1. Spojina lepo kristalizira iz acetonitrila, acetona ali etilacetata v igličastih kristalih. XRD difraktogram kaže signale navedene v tabeli 3 (navedeni so samo signali nad 15% relat. intenzitete).
Tabela 3.
| No. | Položaj [° 2 theta] | Razdalja d [ A ] | Relat. intenziteta |
| 1 | 5,2077 | 16,95574 | 41,12 |
| 2 | 12,2576 | 7,21499 | 65,38 |
| 3 | 16,3771 | 5,40822 | 37,00 |
| 4 | 16,8437 | 5,25944 | 100,00 |
| 5 | 17,3788 | 5,09870 | 47,64 |
| 6 | 18,3355 | 4,83474 | 73,92 |
| 7 | 19,0872 | 4,64601 | 56,65 |
| 8 | 19,6200 | 4,52103 | 38,92 |
| 9 | 20,4326 | 4,34303 | 37,21 |
| 10 | 20,8643 | 4,25413 | 57,53 |
| 11 | 21,5937 | 4,11204 | 26,29 |
| 12 | 22,0858 | 4,02152 | 21,83 |
| 13 | 22,7456 | 3,90634 | 19,16 |
| 14 | 23,4929 | 3,78374 | 15,57 |
| 15 | 24,4831 | 3,63291 | 15,47 |
| 16 | 24,8190 | 3,58449 | 22,19 |
| 17 | 25,8486 | 3,44601 | 22,72 |
| 18 | 27,6789 | 3,22028 | 15,09 |
| 19 | 28,7615 | 3,10148 | 55,69 |
| 20 | 29,4269 | 3,03285 | 31,20 |
| 21 | 30,0668 | 2,96975 | 46,72 |
| 22 | 32,5029 | 2,75251 | 19,68 |
| 23 | 33,9593 | 2,63772 | 19,01 |
| 24 | 35,6444 | 2,51679 | 15,83 |
V odvisnosti od topila za kristalizacijo se pojavljajo manjše variacije v intenziteti signalov pri položajih 2-theta: 5,2, 17,5 in 12,5 zaradi različne orientacije igličastih kristalov.
Benzatinsko sol enalaprila (benzatin enalapril) pripravimo z reakcijo enalaprila in benzatina v molskem razmerju 2:1 in kristalizacijo iz acetona ali metil terc.butiletra. Sol kristalizira v igličastih kristalih, ki v XRD difraktogramu dajo signale navedene v tabeli 4,(navedeni so samo signali nad 10% rel.intenzitete).
Tabela 4.
| No. | Položaj [° 2-thetaj | Razdalja d [ A ] | Relat. intenziteta [1 |
| 1 | 5,7194 | 15,43988 | 100,00 |
| 2 | 13,7934 | 6,41492 | 28,44 |
| 3 | 16,5103 | 5,36489 | 54,37 |
| 4 | 17,7514 | 4,99251 | 17,00 |
| 5 | 18,7449 | 4,73007 | 60,88 |
| 6 | 19,0720 | 4,64968 | 10,32 |
| 7 | 19,4392 | 4,56266 | 13,07 |
| 8 | 20,5924 | 4,30967 | 14,80 |
| 9 | 21,1680 | 4,19377 | 33,97 |
| 10 | 23,3380 | 3,80850 | 26,51 |
| 11 | 24,9277 | 3,56911 | 10,42 |
| 12 | 25,2710 | 3,52141 | 23,54 |
| 13 | 27,9803 | 3,18628 | 29,46 |
| 14 | 35,2158 | 2,54643 | 11,94 |
Benzatinsko sol ramiprila (benzatin ramipril) dobimo z reakcijo ramiprila in benzatina v molskem razmerju 2:1 in kristalizacijo iz vode, acetona ali etilacetata v obliki igličastih kristalov z značilnim XRD difraktogramom, prikazanim v tabeli 5 (navedeni so samo signali z rel. intenziteto večjo od 10%).
Tabela 5.
| No. | Položaj [° 2-theta] | Razdalja d [ A ] | Relat. intenziteta [ 8 |
| 1 | 5,6472 | 15,63699 | 100,00 |
| 2 | 11,2714 | 7,84394 | 41,27 |
| 3 | 13,9095 | 6,36162 | 14,47 |
| 4 | 15,0119 | 5,89683 | 10,67 |
| 5 | 16,5107 | 5,36477 | 49,26 |
| 6 | 17,0071 | 5,20928 | 37,15 |
| 7 | 17,6850 | 5,01109 | 14,42 |
| 8 | 19,8578 | 4,46743 | 10,16 |
| 9 | 20,4361 | 4,34229 | 39,35 |
| 10 | 20,7197 | 4,28348 | 36,94 |
| 11 | 22,5331 | 3,94442 | 89,77 |
| 12 | 24,2194 | 3,67187 | 10,98 |
| 13 | 25,6742 | 3,46701 | 18,31 |
| 14 | 27,5848 | 3,23106 | 26,25 |
| 15 | 33,3840 | 2,68185 | 14,44 |
| 16 | 34,1824 | 2,62102 | 12,71 |
| 17 | 35,7393 | 2,51032 | 10,31 |
Benzatinsko sol cilazaprila (benzatin cilazapril) pripravimo z reakcijo cilazapril hidrata z benzatinom v molskem razmerju 2:1 in kristalizacijo iz etilacetata z dodatkom nheksana ali iz metil terc.butiletra v igličastih kristalih z značilnim XRD difraktogramom, prikazanim v tabeli 6 (navedeni so samo signali višji od 10%).
Tabela 6.
| No. | Položaj [° 2-theta ] | Razdalja d [ A ] | Relat. intenziteta [ |
| 1 | 5,4139 | 16,31028 | 41,24 |
| 2 | 11,7645 | 7,51623 | 12,54 |
| 3 | 13,2925 | 6,65550 | 26,78 |
| 4 | 14,2868 | 6,19446 | 50,55 |
| 5 | 17,2822 | 5,12697 | 100,00 |
| 6 | 21,3132 | 4,16553 | 11,51 |
| 7 | 23,2854 | 3,81700 | 8,00 |
| 8 | 24,8299 | 3,58295 | 10,59 |
Nove soli ACE inhibitorjev, ki so predmet predloženega izuma, lahko uporabimo kot terapevtsko učinkovino, ki jo skupaj z inertnim farmacevtsko sprejemljivim nosilcem pretvorimo v primerno obliko, na primer tablete, in jih nato uporabimo za zdravljenje kardiovaskularnih bolezni, visokega krvnega pritiska in srčnega popuščanja.
Predmet predloženega izuma je tudi farmacevtska formulacija, ki vsebuje nove benzatinske soli ACE inhibitorjev. Kot farmacevtsko sprejemljive pomožne snovi uporabimo v splošnem, povprečnemu strokovnjaku s področja, poznane snovi. Inertne sestavine, oz. farmacevtska pomožne snovi izberemo iz naslednjih skupin:
- polnila kot so: brezvodna laktoza, mikrokristalinična celuloza, škrob, kalcijev fosfat, kalcijev karbonat, razni sladkorji in drugo;
- veziva kot na primer: mikrokristalinična celuloza, hidroksialkilne celuloze, povidon, celulozni estri, škrob ali njihova zmes;
- razgrajevala kot npr.: škrob, zamrežena natrijeva kroskarmeloza, krospovidon, mikrokristalinična celuloza, natrijeva karboksimetil celuloza in drugo, največkrat v količini 1 -10%;
- snovi za mazanje in izboljšanje drsenja pri tabletiranju: smukec, magnezijev stearat, stearinska kislina, kalijev stearat in koloidni silicijev dioksid. Te snovi običajno dodamo k ostalim sestavinam v končni fazi.
Farmacevtske formulacije pripravljamo po postopkih, ki so znani, kot na primer direktno mešanje, suha granulacija, mokra granulacija in tabletiranje ali s pršenjem raztopine benzatinske soli ACE inhibitorja na inertne farmacevtske snovi ob hkratnem sušenju v protitoku toplega zraka. Tako dobljenemu granulatu po potrebi dodamo še druge sestavine, homogeniziramo in tabletiramo na običajen način.
Benzatinska komponenta v obravnavanih novih soleh je vzrok za večjo hidrofobnost učinkovin v tej obliki. Zato realno pričakujemo boljši prehod skozi biološke membrane, kar omogoča tudi pripravo praparata za delovanje skozi kožo - na primer kreme, mazila ali obliža.
Transdermalni sistem je sestavljen iz hrbtne strani nepropustne za aktivno snov , polimerne plasti, ki služi kot rezervar za aktivno učinkovino in je občutljiva na pritisk in zaščitno folijo, ki je na več mestih perforirana, da skoznjo pronica učinkovina.
V smislu izuma lahko dodamo tudi druge, posamezne aktivne snovi, ki izboljšajo osnovno delovanje perindoprila oziroma delujejo sinergistično.To so snovi iz naslednjih skupin:
- diuretiki kot indapamid ali hidroklorotiazid in njihove soli;
- snovi z antitrombotičnim delovanjem kot klopidogrel in acetilsalicilna kislina;
- snovi z antihiperlipoproteinemičnim delovanjem kot rosuvastatin in atorvastatin;
- zaviralci dotoka kalcijevih ionov iz skupine dihidropiridinov kot amlodipin in lacidipin in njihove soli;
- snovi z antioksidantnim delovanjem, na primer suhi ekstrakt zelenega čaja, koencim Qio, idebenon, kurkumin, abigenol, piknogenol in drugi.
Posebno je zanimiva kombinacija s koencimom Qi0 ali ubikinonom, ki je zelo učinkovit antioksidant in lovilec prostih radikalov, poleg tega pa se lahko uporablja pri obolenjih srca, ki so v zvezi z zmanjšanjem pretoka krvi, previsokim krvnim tlakom in pri znakih srčnega popuščanja. Zelo pomemben antioksidant je v zadnjem času tudi kurkumin, ki deluje tudi močno antikancerogeno.
Po pričakovanju so benzatinske soli ACE inhibitorjev presenetljivo stabilne pri staranju. Eksperimentalno smo določili pospešeno stabilnost benzatin perindoprila v primerjavi z nekaterimi drugimi, znanimi solmi perindoprila, s tem, da smo te soli inkubirali pri 50°C in 65% rel. vlage v stekleničkah z PE pokrovčkom. Vsebnost v časovnih intervalih smo določali s HPLC metodo: kolona Kromasil C18, 5μ, 150 x 4,6 mm;
mobilna faza A: 30% acetonitril/ 70% pufer pH= 2,0, mobilna faza B: 90% acetonitril/10% pufer pH=2,0, gradient: od 100% A na 57% A v 20 min, sestava pufra: 0,92 g natrijevega heptansulfonata in 1 ml trietilamina/1000 ml vode, pH 2,0 s HCIO4, temperatura : 20°C, pretok: 1 ml/min.
detekcija: UVpri210nm.
Tabela 7. Padanje vsebnosti soli perindoprila pri inkubaciji pri 50°C in 65% rel. vlage:
| Vrsta soli: | začetno stanje: | 30 dni: | 60 dni | 90 dni |
| Benzatin perindopril | 99,8 | 99,2 | 98,7 | 98,1 |
| Perindopril arginin | 99,8 | 98,9 | 98,5 | 97,9 |
| Perindopril erbumin | 99,6 | 98,6 | 97,6 | 96,5 |
Izum pojasnjujejo naslednji izvedbeni primeri, ki pa ga v ničemer ne omejujejo:
PRIMER 1. Benzatin perindopril - polimorfna oblika A.
Perindopril (1,97 g, 5,35 mmola) raztopimo v 7 ml vode pri 50-60°C in med mešanjem po kapljicah dodamo benzatin (0,6 g, 2,5 mmola). Mešamo in počasi ohlajamo do sobne temperature, nato pustimo stati preko noči pri +5°C. Kristalno kašo filtriramo, speremo z ledeno mrzlo vodo in posušimo v vakuumu pri 50°C. Dobimo 2,32 g (90,3%) bele kristalne soli s tališčem pri 84-89°C (Kofler). XRD praškovni difraktogram je prikazan v tabeli 1. in odgovarja polimorfni obliki A. Elementna analiza (C,H,N) ustreza spojini z empirično fomnulo:(Ci9H32N2O5)2 · Ci6H20N2 = C54H84N6O10 , z molsko maso: 977,3.
PRIMER 2. Benzatin perindopril - polimorfna oblika A.
Perindopril erbumin (2,0 g, 4,53 mmola) raztopimo v 20 ml etilacetata, med mešanjem dodamo benzatin (0,6 g, 2,5 mmola) in v vakuumu pri 60°C odparimo etilacetat do suhega. Suho snov ponovno raztopimo v 25 ml etilacetata in ponovno odparimo etilacetat in suho snov še dobro presušimo v vakuumu ( s tem smo odstranili terc. butilamin). Suho snov nato raztopimo v 10 ml etilacetata pri 70°C in dodamo 5 ml nheksana. Po ohladitvi se izloči iskani benzatin perindopril v obliki finih kristalov s tališčem 82-86°C. Dobimo 1,97 g (88,9%) snovi z XRD difraktogramom kot je naveden v tabeli 1. in odgovarja polimorfni obliki A.
PRIMER 3. Benzatin perindopril - amorfni
Perindopril (1,97 g, 5,35 mmola) raztopimo v 30 ml vode in med mešanjem pri 35°C po kapljicah dodamo benzatin (0,64 g, 2,675 mmola). Hitro ohladimo s suhim ledom in liofiliziramo. Dobimo 2,61 g (100%) amorfnega benzatin perindoprila s tališčem 8087°C.
PRIMER 4. Benzatin perindopril - polimorfna oblika B.
Perindopril (1,0 g, 2,71 mmola) raztopimo v 4 ml etanola in dodamo benzatin (0,33 g, 1,33 mmola). Med mešanjem postopoma dodamo 7 ml metil-terc. butiletra in pustimo sol kristalizirati preko noči pri +5°C. Filtriramo, speremo z metil-terc.butiletrom in osušimo v vakuumu. Kristali (0,67 g, 51,5%) se talijo pri 84-87°C (Kofler) in imajo XRD praškovni difraktogram prikazan v tabeli 2, ki odgovarja polimorfni obliki B.
PRIMER 5. Benzatin perindopril - polimorfna oblika A.
Kot izhodno snov vtem primeru vzamemo perindopril slabe kvalitete (vsebnost: 91,5%, nečistoča B: 1,4%, nečistoča F: 3,1%) . Perindopril (32,4 g, 87,9 mmola) raztopimo v 100 ml etilacetata pri 70-75°C in med mešanjem dodamo benzatin (10,4 g, 43,3 mmola). Nato postopoma dodamo še 100 ml n-heptana da sol prične kristalizirati. Med ohlajevanjem na sobno temperaturo dodamo še 50 ml n-heptana in ohladimo na -15°C za 4 ure. Sol filtriramo in dobro speremo z mešanico etilacetat/n-heptan 1:3, nato še z čistim n-heptanom. Posušimo v vakuumu pri 50°C. Dobimo 40,11 g (93,3%) kristalov s tališčem 87-91 °C in XRD difraktogramom značilnim za polimorfno obliko A.
Dobljena sol je zelo čista: vsebnost 99,8%, nečistoča B 0%, nečistoča F 0,09% .
Ta benzatin perindopril smo uporabili za proizvodnjo poskusnih tablet.
PRIMER 6. Benzatin enalapril.
Enalapril ( 2,24 g, 5,95 mmola) raztopimo v 22 ml acetona, dodamo benzatin ( 0,69 g, 2,87 mmola) in kristaliziramo pri sobni temperaturi 24 ur. Kristale soli odfiltriramo in posušimo v vakuumu. Dobimo 2,33 g ( 81,75%) benzatin enalaprila s tališčem 128130°C (Kofler) in XRD praškovnim difraktogramom prikazanim v tabeli 4. Elementna analiza (C,H,N) ustreza spojini z empirično formulo: (C2oH28N205)2 Ci6H2oN2 = ΟδδΗγβΝθΟιο in molsko maso 993,26.
PRIMER 7. Benzatin enalapril.
Enalapril (0,46 g, 1,22 mmola) raztopimo v 20 ml metil-terc.butiletra in počasi vmešamo benzatin (0,15 g, 0,62 mmola). V prvi fazi nastane želatinasti solvat, ki pri ugretju in mešanju preide v vlaknaste kristale. Po filtriranju in sušenju dobimo 0,59 g (96,7%) benzatin enalaprila s tališčem 128-130°C.
PRIMER 8. Benzatin ramipril.
a) Kristalizacija iz vode.
Ramipril (1 g, 2,4 mmola) raztopimo v 15 ml vode, med mešanjem dodamo benzatin (0,28 g, 1,17 mmola) in segrejemo na 60°C. Po ohladitvi izkristalizira benzatin ramipril, 1,16 g (90%) s tališčem 83-85°C in z značilnim XRD praškovnim difraktogramom priklazanim v tabeli 5.
b) Kristalizacija iz etilacetata.
Ramipril (1,0 g, 2,4 mmola) pri 60°C raztopimo v 15 ml etilacetata in dodamo benzatin (0,28 g, 1,17 mmola). Med mešanjem počasi dodamo 15 ml n-heptana, da sol kristalizira. Dobimo 1,17 g (90,8%) benzatin ramiprila s tališčem 83-84°C in XRD difraktogramom navedenim v tabeli 5.
c) Kristalizacija iz acetona.
Ramipril (1,0 g, 2,4 mmola) raztopimo v 7 ml acetona, ki vsebuje benzatin (0,28,
1,17 mmola) in dodamo n-heptan do prve pomotnitve. Sol kristaliziramo pri sobni temperaturi preko noči. Dobimo 1,13 (87,7%) benzatin ramiprila s tališčem 83-85°C in XRD difraktogramom navedenim v tabeli 5. Elementna analiza (C,H,N) ustreza spojini z empirično formulo: (C23H32N2O5)2. Ci6H20N2 = C62H84N6O10 in molsko maso 1073,4.
PRIMER 9. Benzatin ramipril, drug način kristalizacije.
Natrijevo sol ramiprila (2,1 g, 4,8 mmola) raztopimo v 20 ml vode, nato med mešanjem dodamo raztopino Ν,Ν'-dibenziletilendiamin diacetata (0,865 g,
2,4 mmola v 10 ml vode in ugrejemo na 60°C. Med mešanjem in hlajenjem pri +5°C kristalizira benzatin ramipril. Nastalo sol filtriramo, izperemo z ledeno mrzlo vodo in posušimo. Dobimo 2,22 g (86,1%) soli s tališčem 83-85°C.
PRIMER 10. Benzatin fosinopril
Fosinopril (1,49 g, 2,64 mmola) raztopimo v 20 ml etilacetata in dodamo benzatin (0,314 g, 1,31 mmola) raztopljenega v 10 ml etilacetata. Po kristalizaciji pri sobni temperaturi dobimo 1,30 g ( 72% ) benzatin fosinoprila s tališčem 136-137°C.
XRD praškovni difraktogram je prikazan v tabeli 3. Spojina ima empirično formulo: (C3oH46N07P)2 C16H20N2 = C76H112N4O14P2 in molsko maso 1367,66.
PRIMER 11. Benzatin cilazapril.
Cilazapril hidrat (1,5 g, 3,31 mmola) raztopimo v 40 ml metil terc.butiletra, ugrejemo do vrelišča in dodamo benzatin ( 0,39 g, 1,63 mmola) in kristaliziramo pri +5°C najmanj 10 ur. Dobimo 1,56 g (85,2%) kristalnega benzatin cilazaprila s tališčem 107-108°C.
XRD praškovni difraktogram je prikazan v tabeli 6. Elementna analiza (C,H,N) ustreza spojini z empirično formulo (C22H33N306).Ci6H2oN2= C6oH86N8Oi2 in molsko maso 1111,4.
PRIMER 12. Tablete z benzatin perindoprilom - varianta I.
Sestavine: mg/tableto:
Benzatin perindopril 4,43
Laktoza DCL 21 59,70
Celuloza Avicel 102 19,87
Koruzni škrob 5,00
Magnezijev stearat_1,00
Teža tablete 90,00
Tablete pripravimo s suhim mešanjem in direktnim tabletiranjem.
PRIMER 13. Tablete z benzatin perindoprilom - varianta II.
| Sestavine: | mg/table |
| Benzatin perindopril | 4,43 |
| Laktoza DCL21 | 59,70 |
| Celuloza Avicel 102 | 18,87 |
| Koruzni škrob | 4,00 |
| Natrijeva kroskarmeloza | 2,00 |
| Magnezijev stearat | 1,00 |
| Teža tablete | 90,00 |
PRIMER 14. Formulacija z benzatin ramiprilom in diuretikom.
Sestavine: mg/kapsulo:
Benzatin ramipril 4,8
Hidroklorotiazid 12,5
PRIMER 15. Formulacija z benzatin enalaprilom in lacidipinom.
Sestavine: mg/tableto:
Benzatin enalapril 10,00
Laktoza monohidrat 65,28
Koruzni škrob 6,50
Lacidipin 4,00
Koloidni silicijev dioksid 0,22
Krospovidon 3,00
Magnezijev stearat_1,00
Teža tablete 90,00
PRIMER 16. Benzatin perindopril z antioksidantom.
Sestavine: mg/ tableto:
Benzatin perindopril 8,86
Laktoza DCL21 53,77
Mikrokristalinična celuloza 35,57
Kurkumin 35,00
Krospovidon 4,00
Smukec 1,80
Magnezijev stearat_1,00
Teža tablete 140,00
PRIMER 17. Priprava obliža za transdermalno aplikacijo.
V topilu sestavljenem iz 5 g monometilestra glutarne kisline, 5 g etanola, 5 g butanona in 7 g 1-dodekanola raztopimo 5,5 g benzatin cilazaprila.
Posebej pripravimo 66 g zamreženega akrilatnega polimera iz: 2-etil-heksilakrilata, vinil acetata in akrilne kisline v mešanici topil: etilacetat/n-heksan/izopropanol/ acetilaceton/ toluen = 40/25/25/1/4 (volumski deli) in to raztopino dodamo med močnim mešanjem k predhodno pripravljeni raztopini kale. soli perindoprila. Dobro zmešamo in dodamo še 0,7 g aluminijevega acetilacetonata in pri 20°C mešamo še 4 ure, da zmes polimerizira. Smolnato lepljivo snov nato razprostremo na silikonizirani foliji polietilena v debelini 0,35 mm in topilo odstranimo s sušenjem pri 55°C. Nato adhezivni film prekrijemo s tanko poliestersko folijo debeline 0,15 mm, ki jo na določenih mesti perforiramo s posebnim orodjem.
Seznam slik.
Fig. 1. Rentgenski praškovni difraktogram benzatin perindoprila, polimorfna oblika A. Fig.2. Rentgenski praškovni difraktogram benzatin perindoprila, polimorfna oblika B. Fig.3. Rentgenski praškovni difraktogram benzatin fosinoprila.
Fig.4. Rentgenski praškovni difraktogram benzatin enalaprila.
Fig.5. Rentgenski praškovni difraktogram benzatin ramiprila.
Fig.6. Rentgenski praškovni difraktogram benzatin cilazaprila.
Fig.7. FTIR spekter benzatin perindoprila, polimorfna oblika A.
Fig.8. FTIR spekter benzatin perindoprila, polimorfna oblika B.
Fig.9. FTIR spekter benzatin fosinoprila.
Fig. 10. FTIR spekter benzatin enalaprila.
Fig. 11. FTIR spekter benzatin ramiprila.
Fig. 12. FTIR spekter benzatin cilazaprila.
1. Soli ACE inhibitorjev z Ν,Ν'-dibenziletilendiaminom (benzatinom) s splošno formulo:
Claims (14)
- Patentni zahtevki.ACE . HN-CH2CH2-NH . ACECH^Hs CH2C6H5 kjer ACE pomeni molekulo ACE inhibitorja in se soli nahajajo v amorfni ali kristalni obliki.
- 2. Benzatinsko sol perindoprila v kristalni polimorfni obliki A z naslednjim rentgenskim praškovnim difraktogramom:
No. Položaj [° 2 theta] Razdalja d [ A ] Relat. intenziteta 1 5,8949 14,98041 25,01 2 6,5122 13,56185 100,00 3 10,7061 8,25681 24,99 4 12,0797 7,32081 17,38 5 14,8462 5,96227 20,12 6 16,0810 5,50712 18,65 7 16,6625 5,31622 24,27 8 17,6098 5,03231 17,22 9 17,8417 4,96743 45,19 10 19,0928 4,64466 47,09 11 15,5830 4,52949 32,66 12 20,5267 4,32333 18,58 13 21,3166 4,16487 31,09 14 21,4948 4,13075 20,08 15 22,0069 4,03576 28,04 16 22,6724 3,91880 15,78 17 23,9340 3,71500 43,77 18 25,0831 3,54736 18,66 19 25,5437 3,48442 16,50 20 28,1560 3,16680 18,30 21 29,6824 3,00733 28,99 22 35,0811 2,55590 20,18 Benzatinsko sol perindoprila v kristalni polimorfni obliki B z naslednjim rentgenskim praškovnim difraktogramom: No. Položaj [° 2 theta] Razdalja d [ A ] Relat. intenziteta [ % ] 1 6,5142 13,55760 100,00 2 11,5531 7,65333 28,99 3 12,1045 7,30591 15,95 4 14,8847 5,94695 14,10 5 16,0939 5,50275 13,61 6 17,6270 5,02743 13,85 7 19,6125 4,52273 47,32 8 20,1330 4,40696 14,26 9 20,5802 4,31221 23.59 10 20,4838 4,13283 10,67 11 22,0327 4,03110 22,73 12 23,1710 3,83558 21,40 13 24,0011 3,70477 26,78 14 26,1996 3,39866 11,24 15 26,6917 3,00640 14,75 16 30,5506 2,92381 12,96 17 36,6578 2,44950 13,62 - 4. Benzatinsko sol perindoprila v amorfni obliki.
- 5. Benzatinsko sol fosinoprila v kristalni obliki z naslednjim rentgenskim praškovnim
difraktogramom: No. Položaj [° 2 theta] Razdalja d [ A ] Relat. intenziteta [% ] 1 5,2077 16,95574 41,12 2 12,2576 7,21499 65,38 3 16,3771 5,40822 37,00 4 16,8437 5,25944 100,00 5 17,3788 5,09870 47,64 6 18,3355 4,83474 73,92 7 19,0872 4,64601 56,65 8 19,6200 4,52103 38,92 9 20,4326 4,34303 37,21 10 20,8643 4,25413 57,53 11 21,5937 4,11204 26,29 12 22,0858 4,02152 21,83 13 22,7456 3,90634 19,16 14 23,4929 3,78374 15,57 15 24,4831 3,63291 15,47 16 24,8190 3,58449 22,19 17 25,8486 3,44601 22,72 18 27,6789 3,22028 15,09 19 28,7615 3,10148 55,69 20 29,4269 3,03285 31,20 21 30,0668 2,96975 46,72 22 32,5029 2,75251 19,68 23 33,9593 2,63772 19,01 24 35,6444 2,51679 15,83 - 6. Benzatinsko sol enalaprila v kristalni obliki z naslednjim rentgenskim praškovnim difraktogramom:
No. Položaj [° 2-thetaj Razdalja d [ A ] Relat. intenziteta [ % ] 1 5,7194 15,43988 100,00 2 13,7934 6,41492 28,44 3 16,5103 5,36489 54,37 4 17,7514 4,99251 17,00 5 18,7449 4,73007 60,88 6 19,0720 4,64968 10,32 7 19,4392 4,56266 13,07 8 20,5924 4,30967 14,80 9 21,1680 4,19377 33,97 10 23,3380 3,80850 26,51 11 24,9277 3,56911 10,42 12 25,2710 3,52141 23,54 13 27,9803 3,18628 29,46 14 35,2158 2,54643 11,94 - 7. Benzatinsko sol ramiprila v kristalni obliki z naslednjim rentgenskim praškovnim
difraktogramom: No. Položaj [° 2-thetaj Razdalja d [ A ] Relat. intenziteta [ % ] 1 5,6472 15,63699 100,00 2 11,2714 7,84394 41,27 3 13,9095 6,36162 14,47 4 15,0119 5,89683 10,67 5 16,5107 5,36477 49,26 6 17,0071 5,20928 37,15 7 17,6850 5,01109 14,42 8 19,8578 4,46743 10,16 9 20,4361 4,34229 39,35 10 20,7197 4,28348 36,94 11 22,5331 3,94442 89,77 12 24,2194 3,67187 10,98 13 25,6742 3,46701 18,31 14 27,5848 3,23106 26,25 15 33,3840 2,68185 14,44 16 34,1824 2,62102 12,71 17 35,7393 2,51032 10,31 w - 8. Benzatinska sol cilazaprila v kristalni obliki z naslednjim rentgenskim praškovnim difraktogramom:
No. Položaj [° 2-theta ] Razdalja d [ A ] Relat. intenziteta [ 3 1 5,4139 16,31028 41,24 2 11,7645 7,51623 12,54 3 13,2925 6,65550 26,78 4 14,2868 6,19446 50,55 5 17,2822 5,12697 100,00 6 21,3132 4,16553 11,51 7 23,2854 3,81700 8,00 8 24,8299 3,58295 10,59 - 9. Postopek za pripravo benzatinskih soli ACE inhibitorjev s splošno formulo:ACE . HN-CH2CH2-NH . ACECH2C6H5 ch2c6h5 z reakcijo dveh molov ACE inhibitorja z enim molom N,N'-dibenziletilendiamina.
- 10. Postopek za pripravo benzatinskih soli v kristalni obliki po zahtevku 9, označen s tem, da pri kristalizaciji uporabimo kot topilo vodo ali organsko topilo iz skupine estrov, nižjih alkoholov, ketonov, nitrilov ali etrov, prednostno etilacetat, aceton, etanol, acetonitril in metil-terc.butileter.
- 11. Postopek za pripravo benzatinskih soli ACE inhibitorjev v amorfni obliki po zahtevku 9, označen s tem, da pripravimo raztopino benzatinske soli v vodi, ki jo zamrznemo in liofiliziramo ali pretvorimo v suho stanje na drug način, da ne pride do kristalizacije.
- 12. Postopek za pripravo granulata, ki vsebuje benzatinske soli ACE inhibitorjev po zahtevkih od 1 do 8, označen s tem, da vodno ali alkoholno/vodno raztopino benzatinske soli ACE inhibitorja pršimo na mešanico neaktivnih sestavin za pripravo granulata ter hkrati sušimo v protitoku toplega zraka s temperaturo največ 60 C.2.4
- 13. Farmacevtska formulacija, ki vsebuje benzatinske soli ACE inhibitorjev po zahtevkih od 1 do 8.
- 14. Farmacevtska formulacija, ki vsebuje benzatinske soli ACE inhibitorjev po zahtevkih od 1 do 8, označena s tem, da vsebuje še eno ali več spojin iz skupine diuretikov, antitrombolitikov, zaviralcev dotoka kalcijevih ionov, antihiperlipoproteinemikov ali antioksidantov.
- 15. Farmacevtska formulacija po zahtevkih 13 in 14 za uporabo pri zdravljenju kardiovaskularnih bolezni, povezanih s previsokim krvnim pritiskom, ishemijo in srčno oslabelostjo.
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| SI200900255A SI23149A (sl) | 2009-09-21 | 2009-09-21 | Nove benzatinske soli ACE inhibitorjev, postopek za njihovo pripravo in njihova uporaba za zdravljenje kardiovaskularnih bolezni |
| RU2012116127/04A RU2012116127A (ru) | 2009-09-21 | 2010-09-17 | Новые бензатиновые соли ингибиторов асе, способ их получения и их применение для лечения сердечно-сосудистых заболеваний |
| PCT/SI2010/000052 WO2011034509A2 (en) | 2009-09-21 | 2010-09-17 | New benzathine salts of ace inhibitors, process for their preparation and their use for the treatment of cardiovascular diseases |
| CN2010800583132A CN102753167A (zh) | 2009-09-21 | 2010-09-17 | 新的ace抑制剂的n,n’-二苄基乙二胺盐、它们的制备方法和它们用于治疗心血管疾病的用途 |
| EP10779347.3A EP2480231B1 (en) | 2009-09-21 | 2010-09-17 | New salts of perindopril with benzathine, process for their preparation and their use for the treatment of cardiovascular diseases |
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| GB0624090D0 (en) * | 2006-12-01 | 2007-01-10 | Selamine Ltd | Ramipril amine salts |
| SI22542A (sl) | 2007-06-04 | 2008-12-31 | Diagen D.O.O. | Stabilna formulacija amorfnih soli perindoprila, postopek za njeno pripravo v industrijskem merilu in njena uporaba za zdravljenje hipertenzije |
| CN101332191B (zh) * | 2008-07-10 | 2013-01-09 | 沈阳药科大学 | 一种稳定的培哚普利叔丁胺盐片剂及其制备方法 |
-
2009
- 2009-09-21 SI SI200900255A patent/SI23149A/sl not_active IP Right Cessation
-
2010
- 2010-09-17 EP EP10779347.3A patent/EP2480231B1/en active Active
- 2010-09-17 WO PCT/SI2010/000052 patent/WO2011034509A2/en not_active Ceased
- 2010-09-17 CN CN2010800583132A patent/CN102753167A/zh active Pending
- 2010-09-17 RU RU2012116127/04A patent/RU2012116127A/ru not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011034509A3 (en) | 2011-05-12 |
| RU2012116127A (ru) | 2013-10-27 |
| CN102753167A (zh) | 2012-10-24 |
| EP2480231B1 (en) | 2017-05-10 |
| EP2480231A2 (en) | 2012-08-01 |
| WO2011034509A2 (en) | 2011-03-24 |
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