IE60412B1 - New anthracyclines - Google Patents

New anthracyclines

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Publication number
IE60412B1
IE60412B1 IE153887A IE153887A IE60412B1 IE 60412 B1 IE60412 B1 IE 60412B1 IE 153887 A IE153887 A IE 153887A IE 153887 A IE153887 A IE 153887A IE 60412 B1 IE60412 B1 IE 60412B1
Authority
IE
Ireland
Prior art keywords
epi
glycoside
formula
group
deoxy
Prior art date
Application number
IE153887A
Other versions
IE871538L (en
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Erba Farmitalia
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Erba Farmitalia filed Critical Erba Farmitalia
Publication of IE871538L publication Critical patent/IE871538L/en
Publication of IE60412B1 publication Critical patent/IE60412B1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H15/00Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
    • C07H15/20Carbocyclic rings
    • C07H15/24Condensed ring systems having three or more rings
    • C07H15/252Naphthacene radicals, e.g. daunomycins, adriamycins
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00Antineoplastic agents

Abstract

Anthracycline glycosides represented by the general formulae (I) and (II): in which R1 represents a hydrogen atom or a hydroxyl group, and their pharmaceutically acceptable addition salts with an acid. Use of these compounds as antitumour agents.

Description

j The invention relates to novel anthracycline glycoside derivatives/ to their preparation and to pharmaceutical compositions containing them™ The present invention provides anthracycline 5 glycosides having the general formulae (II): a: It, = H b: R1 = OH wherein R1 represents a hydrogen atom or hydroxyl group; and pharmaceutically acceptable acid addition salts thereof.
The invention also provides a process for the preparation of a glycoside of formula (II) wherein R.( represents a hydrogen acom? i.e. compound (Ila) , or a hydroxy grcip, i.e™ compound (lib) , or a phar aaceutically acceptable acid addition salt thereof, which process comprises converting 3'-deamino-4'-deoxv-3e-epi~4'- into the corresponding N-trifluoroacetyl derivative; converting the said N-trifluoroacetyl derivative into 4*deoxy-4"-epi-tr ifluoroacetamido-3’-deamino-3 8-hvdroxydaunorubicin; removing the K-trifluoroacetyl group from the 48-deoxy-4’-epi-tri fluoroacetarnido-3’-deamino™3’-hydroxydaunorubicin so as to obtain the glycos ) of formula (XI) wherein Rx is a hydrogen atom; if desired, converting the said glycoside of formula (II) into a pharmaceutically acceptable acid addition salt thereof; if desired, brominating the said glycoside of formula (II) or pharmaceutically acceptable salt thereof and hydrolysing the 14-bromo derivative thus obtained so as to form the glycoside of formula (II) wherein Rx is a hydroxy group; and, if desired, converting the said glycoside formula (II) wherein Rx is a hydroxy group into a pharmaceutically acceptable acid addition salt thereof.
Treatment of the 3’ f, 4'-epimino daunorubicin derivative (la) with trifluoroacetic anhydride gives the corresponding N-trifluoroacetyl derivative (Ve).
Reaction of this compound with a catalytic amount of sulfuric acid in acetone gives 43"deoxy-4’~epitr ifluoroacetamido-3 9-deamino-3hydroxy-daunorublein (VI) which,,, by treatment with aqueous sodium hydroxidet, gives the compound (Ila) . Typically,, the N-trifluoroacetyl group may be removed by mild alkaline hydrolysis» at a temperature of 0°C by means of 0.1N aqueous sodium hydroxide. Glycoside (Ha) can be isolated as its hydrochloride by treatment with hydrogen chloride in methanol.
The 3’-deamino-4’-deoxy-3'-epi-4’-epi-3’ t. 4’-epimino-daunorubicin» i.e. compound (la)f may be prepared by reacting 3’-epi-daunorubicin with salicylaldehvde so as to obtain the corresponding 39-epi-N-salicylidene derivative; converting the 4’-hydroxy group of the said 3'-epx-N-salicylidene derivative into a trifluocomethanesulfonate group; and removing from the 3’-epi-N-salicylidene-4’-O-trixluoromethanesulfonafce thus obtained the salicylidene group by acid hydrolysis so as to cause the 3’-deamino-4’-deoxy-3’-epi-4*-epi-3’» 4’-epimino-daunorubicin to be obtained via displacement of the 4’-O~trifluoromethanesulfonate group.
The compound (la) may therefore be prepared by reaction of the 3'-amino group of 3'-epi-daunorubicin (III) (F. Arcamone, A. Bargiotii, G. Cassinelli: Ger.Patent 2752115 (June 1, 1978)) with salicylaldehyde, in a mixture of water and acetone at room temperature, to obtain the corresponding 3*-epi-N~salicylidene derivative (IVc) which by treatment with trixluoromethanesulfonic anhydride in anhydrous methylene dichloride and in the presence of pyridine gives the corresponding 3’-epi-N-salicylidene4‘-’-•O-trifluoromethansulfonate (XVd). This compound, dissolved in methanol, can then be subjected to acidic hydrolysis of the salicylidene protecting group by means of p-fcoiuensulfonic acid at room temperature to give, via the displacement cf tr ifluoromethanesulfonate leaving group, the desired compound of formula (la).
The compound (lib) can be prepared by bromination of (Ila) followed by treatment of the resultant 14-bromo derivative with aqueous sodium formate at room temperature, according to the procedure described in United Patent Specification No. 3803124. It may be isolated as its hydrochloride in the same manner as glycoside (Ila).
The processes of the invention are summarised in the reaction scheme below.
The present invention also provides a pharmaceutical composition comprising as active ingredient an anthracycline glycoside of the Invention or 1- 5 pharmaceutically acceptable acid addition salt thereof together with a pharmaceutically acceptable carrier or J diluent. A therapeutically effective amount of a compound of formula (II) is combined with an inert carrier.
Conventional carriers may be used and the composition may be formulated in conventional manner.
The compounds of the invention are useful in methods of treatment of the human or animal body by therapy. In particular# the compounds of the invention are useful as antitumor agents JV c — d VI C Rn: OOHC-H.CH= o 4s d R2: OOHCgH^CHRj: OH R3: OSO2CF3 e : COCF3 The following Examples illustrate the invention.
EXAMPLE 1 3 -epi-N-salicylidene-daunorubicin (IVc) n solution of 2 c of 3’-epi-daunoruhicin (III) in a mixture of 80 ml of water and 20 ml of acetone, was treated at room temperature with 0.5 ml of salicylaldehyde at ph 8» After 10 mins, ethyl acetate was added and the organic phase separated off, washed with water twice, dried over anhydrous sodium sulphate, filtered and evaporated to dryness under vacuum.
The residue was first triturated with hexan*·· ·ο eliminate the traces of salicylaldeyde, then collected an; dried under vacuum at 30°C to give (IVc) in almost quantitative yield. Rf 0.21 on TLC Kieselgel F 254 (Merck) using as eluent the solvent mixture CH^Cl .^-Acetone (8/2 v/v) .
EXAMPLE 2 3’-deamino-4-deoxy-3’-epi-4 9-epi-3·, 4 9-epiminv20 daunorubicin (la) To a solution of 2 g of 33-epi-N-salicylidene daunorubicin (IVc) in 20 ml of anhydrous dichloromethane and 2.ml of dry pyridine kept at -10°C, was added a solution of 0.8 ml of trifluoromethane sulfonic anhydride in 10 ml of dichloromethane. After 1 hour at -10°C, the mixture was diluted with dichloromethane and washed with water, cold 0.1M hydrochloric acid, cold aqueous 5% w/v sci hydrogen carbonate and water. The organic phase, dried over anhydrous sodium sulphate, was filtered off and the solvent removed in vacuo to give (IVd) Rf 0.50 on TC Kieselgel F 254 (Merck) using as eluent the solvent mixture CH2Cl2-Acetone (95/5 v/v).
The crude product was dissolved in 50 ml of methanol and 0.2 g of p~toluensulfonic acid monohydrate was added. The solution was kept at room temperature for 1 hour, then 100 ml of water was added and extracted with little dichloromethane. The aqueous phase was adjusted to pH 8 with 0.1M sodium hydroxyde and dichloromethane added. The organic phase was separated off, washed with water, dried over anhydrous sodium sulphate and the solvent evaporated to a small volume.
The mixture was purified by chromatography on a column of silica gel buffered at pH 7 using dichloromethane-ethanol as eluent. The eluate containing the product (la) was washed with water, evaporated in vacuum, picked up with a little dichloromethane and crystallised FD HS 509 [H+J m.p. 135-137°C Rf 0.38 on TLC Kieselgel F 254 (Merck) using as eluent the mixture CH3Cl2-CH30H~CH3eOOH-H2O (30/4/1/0.5 v/v). 1,(200 KHz t CDC13): 8.02 (dd, J«l.l, 7.7Hz, IH, H-l) 7.76 (dd, J=7.7, 7.7Hz, IH, H-2) „ 8 - 7.37 (dd, J=l.le 7.7Hz , IH, H-3) 5.31 (dd, J=3.0, 4.8Hz , IH, H-l’) 5.17 (dd, J=2»0, 3.6Hz , IH, H-7) 4.32 (qd, J=<1, 6.7Hz , IH, H-5’) 4.07 (S, 3H, OCH3-4) 3.17 (dd, J=19.2Hz, 1H , H-lOe) 2.95 (d, J=19.2Hz, IH, H-lOax) 2.46 (ddd, J=2.0, 2.0, 15.0Hz, IH, H-8e) 2.43 (S, 3H, COCH3) 2.30 (ddd, J-1.5, 4.3, 6.4Hz, IH, H-3) 1.9-2 .0 (m, 2H, H-eax, H-2ax, 1.87 (ddd, J~1.5, 3.0, 14.6Hz, IH. H2’e) 1.44 (d, J=6.7Hz, 3H, CH3-59) EXAMPLE 3 ' "deamino-4 -deoxy-? ’ -hydroxv·-» *-epi-4 ’ -aminodaunorubicin (Ila) The title compound was prepared starting fioir. the asir idine la. Ig of la was transformed into the N-trifluoroacetyl derivative Ve by treatment with 1.2 ml of trifluoroacetic anhydride in anhydrous methylene dichloride. After work up the crude material (Rf 0.'/ on TLC, Kieselgel F 254 (Merck) using as eluent the solvent mixture CH^Cl^-Aeetone (4/1 v/v)] was dissolved in 20 ml of acetone and treated with a catalytic amount of sulfuric acid at 10°C.
T.he mixture was diluted with 200 ml of methylene dichloride# washed with water# aqueous 5% w/v so+ hydrogen carbonate and water, The solvent was removed in j vacuum and the residue purified on a column of silica gel using methylene dichloride as the eluting system to afford 0.7 g of pure VI.
Rf 0.21 on TLC# Kieselgel F 254 (Merck) using as eluent the solvent mixture CH2C12-Acetone (4/1 v/v).
The product VI was slowly dissolved in aqueous 0.1N sodium hydroxide, at 0°C in order to perform the hydrolysis of the N-trifluoroacetyl protecting group.
After 1 hour at 0°C, th® solution was adjusted to pH 8.6 with 0.1N hydrochloric acid and extracted with methylene dichloride. The solvent was evaporated off, affording 0.5 g of a residue that was converted by treatment with methanolic hydrogen chloride into the hydrochloride of 4'-deoxy-4'-amino-4'-epi-3'~deamino3e’ -hydroxy-daunorubi cin.
MS FD 527 (K+h m.p.l53°C (dec).
Rf 0.18 on TLC Kieselgel F 254 (Merck) using the solvent system CH,Cl2~CH3OH~CH3CQQH~HZO (30/4/1/0.5 v/v) 1 A'H a - NMR (200 MH?, CDC13) 8.02 (dd, 1^0.9 , 8.5Hz, IH, H-l) 7.77 (dd, , 3.5Hz, IH, H-2) 7.38 (dd, J-0.9 , 8.5Hz, IH, H-3 ) 5.52 (dd, J=<1, 4.0Hz, IH, H-lf ) .28 (dd, J=1.8, 4.0Hz, IH, H-7) 4.07 (S, 3H, OCH3-4) 3.69 (dq, J=6.3, 9-5Hz, IH, H-5’) 3.51 (ddd, J=4.8, 9.5, 11.6Hz, IH, H- 3.22 (dd, Js1.9, 18.9Hz , IH, H-lOe) 2.94 (d, J-18.9Hz, IH, H-iOax) 2.40 (s, 3H, COCH3) 2.2-2 .4 (in, IH, H-8ax) 2.30 (dd, J=9.5, 9.5Hz, IH, H-4 9 ) 2.0-2 .2 (m, 2H, H-8e, H -2 *e) 1.70 ’ (ddd, J = 4.0, 4..6, 13.2Hz, IH, H· 1.31 (d, J=6.3Kz, 3H, CH3-53) EXAMPLE 4 39»deamino-3’"hydroxy-4 ‘-deoxy-A’-ep amino-doxorubicin (lib) 0.5 g of Ila was dissolved in a mixture of methanol and dioxane. The solution was treated„ as described in united Patent Specification No.3,803,124 first with bromine to give the 14-bromo-derivative and then with aqueous sodium formate to give the title com-.'ound.
This was converted into its hydrochloride by treatment with methanolic hydrogen chloride. FD-MS 543 (M+)„ TLC on Kieselgel F 254 (Merck) using the solvent system CHjCl2"CH3OH~CH3COOH~H9O (30/4/1/0.5 v/v) Rf 0.10.
The cytotoxic activity of the new anthracycline glycoside of the invention (Ila) was tested in vitro against HeLa cells P388, P388/DX, LoVo and LoVo/DX.
Time of exposure to the compound: 24 hours/in comparison with daunorubicin.
The results are shown in Table 1.
The compound, when tested in vitro against P-388 ascitic leukemia and Gross leukemia, exhibited good antitumor activity, in comparison with daunorubicin, especially when orally administered.
The results are given in Tables 2 and 3.
Table 1 In vitro activity of 3i-deamino-4,-deoxy-3i=-hydrcxy-4I-epi=4 1-aniino-oaunorubicin (Ila) in comparison with DNR ID (ng/ml) Compound _____________________________ ~ _ . b) c) d) e) f) HeLa P388 P388/DX LoVo LoUo/Dx DNR ,5 730 43 820 I CN «"Ί i I la 24,5 235 230 a) Dose giving 50% reduction of cell number in comparison with untreated controls. b) Human cervix epithelioid carcinoma cells c) P 388 leukemia cells sensitive to Doxorubicin . . d) P 238 leukemia cells resistant' to Doxorubicin e) Human colon adenocarcinoma cells Sensitive to Doxorubicin f) Human colon adenocarcinoma cells resistant to ,κ ubicin Table 2 Effect against P 383 ascitic leukemia Compound dose T/C%C ... . d lox ic deaths DiJR 2.9 155 0/10 Xj « 170 8/10 Ila 1.96 Ί55 0/10 2.9 150 0/10 ' 140 9/10 6.6 100 10/10 ^CxDeriments were performed in CDF. mice, inccnlated '.’ith 10 leukemia cells i.p. b Treatment i.p. on day 1 ePei tumor inoculum.
'Median survival time of treated mice/mecian controls x 100. :ur Evaluated on the basis of autoptic findings. - 14 Table 3 Effect against Gross leukemia Compound dose mg/Kg T/c%c DNR 10 15 165 192 G/20 2/20 Ila 8.2 . 175 0/20 11.5 230 0/10 Toil 240 0/10 22.5 130 0/10 atxpegiments were performed in C3H mice, inocul, 2x10 leukemia cells i.v. b Treatment i.v. on day 1 after tumor inoculum. :ed CMedian survival time of treated tnice/median survival time of controls x 100. d Evaluated on the basis of autoptic findings.

Claims (12)

1. An anthracvcline glycoside having the genetc'. formula (II): OH (II) II a,b where j 5 1 represents a hydrogen atom or a hydroxyl group, 5 and pharmaceutically acceptable acid addition salts thereof.
2. - A compound according to claim 1» which is 3 ’-deamino~4-deoxy-3 *-hydroxy-4’-epi-4'-amino-daunorubicin or its hydrochloride. 10 3. A compound according to claim 1, which is
3. '-deamino-4 ,J -deoxy-3 ’-hydroxy-4 ? -epi-4 ’-amino-doxorubicin or its hydrochloride.
4. Ά process for the preparation of a glycoside of formula (II) as defined an claim 1 or a pharmaceutically 15 acceptable salt thereof, which process comprises converting 3-deamino-4'-deoxy-3’-epi-4'-epi-3’,4’-epimino-daunorubicin into the corresponding N-trifluoroacetyl derivative; converting the said N-trifluoroacetyl derivative into 4 a -deoxv-4“epi-ttrrluoroacetamidor 3 5 -deamino-3’-hydroxy daunorubicin; removing the N-trifluoroacetyl group from the 4 e -deoxy-4 9 -epi- k tr ifluoroacetamido-3 u -dearnino-3’-hydroxy 5. Daunorubicin so as to obtain the glycoside of formula (II) wherein R^ is a hydrogen atom; if desired, converting the said glycoside of formula (II) into a pharmaceutically acceptable acid addition salt thereof; if desired# brominating the said glycoside of formula (II) or 10 pharmaceutically acceptable salt thereof and hydrolysing the l4-bromo derivative thus obtained so as to form the glycoside of formula (II) wherein R^ is a hydroxy group; and# if desired, converting the said glycoside of formula (II) wherein is a hydroxy group into a pharmaceutically 15 acceptable acid addition salt thereof.
5. A process according to claim 4, wherein the 3'-deamino-4-deoxy-3’-epi-4 e -epi«3’#4’-epiminodaunorubicin is reacted with trifluoroacetic anhydride to obtain the corresponding N-trifluoroacetyl derivative 20 which, by treatment with a catalytic amount of sulfuric acid in acetone gives 4’-deoxy-4 9 epi-trifluoroacetamido-3 5 deamino -3’-hydroxy-daunorubicin; removing the N-trifluoroacetyl protecting group therefrom by mild alkaline hydrolysis, at a temperature of 0°C, by means of i. 25 O.lN ageuous sodium hydroxide; optionally, isolating the glycoside of formula (II) wherein is a hydrogen atom as its hydrochloride by treatment with hydrogen chloride in methanol; optionally, converting the said glycoside of formula (II) or hydrochloride thereof to the glycoside of formula (II) wherein is a hydroxy group by bromination followed by treatment of the resultant 14-bromo derivative with aqueous sodium formate at room temperature; and, optionally, isolating the said glycoside of formula (II) wherein is a hydroxy group as its hydrochloride by treatment with a methanolic solution of hydrogen chloride.
6. A process according to claim 4 or 5 wherein the 3 5 -deamino-4’-deoxy-3’-epi-4-epi-3, 4’-epiminodaunorubicin is prepared by reacting 3-epi-daunorubicin uifch salicylaldehyde so as to obtain the corresponding 3 -epi-N-salicylider';· derivative; converting the 4’-hydrcxy group of the said 3’- epi -N-salicylxdene derivative into a trifluoromethanesulfonate group; and removing from the 3’ep i-N-· salicylidene-4'-O-trifIuoromethanesulfonate thus obtained the salicylidene group by acid hydrolysis so as tc cause the 3'-deanino-4’-deoxy -3-epi-4'-epi-3’, 4 3 -epiminodaunorubicin to be obtained via displacement of the 4 s -O-trifluoromethanesulfonate group.
7. A process according to claim 6, wherein 3’-epi-daunorubicin dissolved in a mixture of water and acetone is reacted, at room temperature, with salicylaldehyde to obtain the corresponding 3*-epi~N~salicylidene derivative which is subsequently 18 treated, in anhydrous methyler.: ciculoride and in tr... presence of dry pyridine, with tr if luoromethanesul f or. ic anhydride to give the corresponding N-salicylidene-3'-epi-4’-O-trifluoromethanesulfonate of which the 5 salicylidene, protecting group is subjected to acidic hydrolysis by means of p-toluensulfonic acid, at room temperature with the said trifluorornethanesulfonate being dissolved in methanol, to obtain, via the displacement of the trifluorornethanesulfonate leaving group, the 10 3'-deamino-4’-deoxy-3’-epi-4’-epi-3’, 4’-epiminodaunqrubjcin.
8. » A pharmaceutical composition comprising an antnracycline glycoside of formula (II) as defined in claim 1 or a pharmaceutically acceptable acid addition 15 salt thereof» together with a pharmaceutically acceptable carrier or diluent, ?. An anthracycline glycoside of formula (IX) ss defined in claim 1, or a pharmaceutically acceptable salt thereof, for use in a method of treatment 20 of the human or animal body by therapy10. An anthracycline glycoside or salt thereof according to claim 9 for use an an antitumor agent.
9. 11. A process for the preparation of an anthracycline glycoside of formula (ΪΧ) as defined in claim 25 1 or a pharmaceutically acceptable salt thereof, said process being substantially as hereinbefore described in - 19 Example 3 or Examples 3 and 4 together.
10. 12. An anthracycline glycoside, as defined in J acia addition claim 1 or a pharmaceutically acceptable/salt thereof whenever prepared by a process as claimed in any of claims 4 to 7 or claim 11. as defined in
11. 13« An anthracycline glycoside acid additipn , . claim 1 or a pharmaceutically acceptableysalt thereof substantially as hereinbefore described with reference to Example 3 or Examples 3 and 4 together. as defined in Claim 8»
12. 14«. A pharmaceutical composition/substantially as hereinbefore described by way of Example.
IE153887A 1986-06-12 1987-06-10 New anthracyclines IE60412B1 (en)

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GB868614323A GB8614323D0 (en) 1986-06-12 1986-06-12 Anthracyclines

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DE3842836A1 (en) * 1988-12-20 1990-06-21 Behringwerke Ag RHODOMYCINE WITH A MODIFIED CARBOHYDRATE UNIT
GB9325417D0 (en) * 1993-12-13 1994-02-16 Erba Carlo Spa 3'- aziridino-anthracycline derivatives
IT1275953B1 (en) * 1995-03-22 1997-10-24 Sicor Spa PROCEDURE FOR THE PREPARATION OF ANTIBIOTICS OF THE CLASS OF ANTHRACYCLINES
GB9808027D0 (en) * 1998-04-15 1998-06-17 Pharmacia & Upjohn Spa 13-dihydro-3' aziridino anthracyclines
WO2000026223A2 (en) * 1998-11-02 2000-05-11 Board Of Regents, The University Of Texas System Methods and compositions for the manufacture of highly potent anthracycline-based antitumor agents
GB0114654D0 (en) * 2001-06-15 2001-08-08 Pharmacia & Upjohn Spa Anti-tumor compound
CN110483871A (en) * 2019-08-15 2019-11-22 陈全明 A kind of HDPE double-wall corrugated pipe of anti-pressure and abrasion-proof

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US3803124A (en) * 1968-04-12 1974-04-09 Farmaceutici It Soc Process for the preparation of adriamycin and adriamycinone and adriamycin derivatives
EP0051280B1 (en) * 1980-11-01 1984-07-11 FARMITALIA CARLO ERBA S.p.A. Anthracycline glycosides, process for the preparation thereof, intermediate compounds and their preparation and pharmaceutical compositions
GB8508079D0 (en) * 1985-03-28 1985-05-01 Erba Farmitalia Antitumor anthracyclines

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IT8720834A0 (en) 1987-06-09
FI872571A (en) 1987-12-13
FI84075B (en) 1991-06-28
AU595328B2 (en) 1990-03-29
GR870909B (en) 1987-10-12
AT392793B (en) 1991-06-10
IT1215552B (en) 1990-02-14
SE8702409D0 (en) 1987-06-10
CH676985A5 (en) 1991-03-28
IE871538L (en) 1987-12-13
ES2006488A6 (en) 1989-05-01
SE500732C2 (en) 1994-08-15
FI872571A0 (en) 1987-06-09
FR2600066B1 (en) 1992-05-15
NL8701349A (en) 1988-01-04
AU7410887A (en) 1987-12-17
HU196220B (en) 1988-10-28
DE3719377A1 (en) 1987-12-17
IL82820A0 (en) 1987-12-20
DE3719377C2 (en) 1995-09-28
GB2195998A (en) 1988-04-20
HUT43866A (en) 1987-12-28
SU1590045A3 (en) 1990-08-30
ZA874202B (en) 1988-02-24
BE1000158A4 (en) 1988-06-28
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GB8713443D0 (en) 1987-07-15
JP2516769B2 (en) 1996-07-24
ATA144987A (en) 1990-11-15
CA1291122C (en) 1991-10-22
KR880000459A (en) 1988-03-26
GB2195998B (en) 1990-02-14
NZ220604A (en) 1989-10-27
KR950004897B1 (en) 1995-05-15
FI84075C (en) 1991-10-10
GB8614323D0 (en) 1986-07-16
SE8702409L (en) 1987-12-13
PT85056A (en) 1987-07-01
PT85056B (en) 1990-03-30
FR2600066A1 (en) 1987-12-18

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