FR2482602A1 - Procede pour la preparation d'acide ursodesoxycholique de purete elevee - Google Patents
Procede pour la preparation d'acide ursodesoxycholique de purete elevee Download PDFInfo
- Publication number
- FR2482602A1 FR2482602A1 FR8109312A FR8109312A FR2482602A1 FR 2482602 A1 FR2482602 A1 FR 2482602A1 FR 8109312 A FR8109312 A FR 8109312A FR 8109312 A FR8109312 A FR 8109312A FR 2482602 A1 FR2482602 A1 FR 2482602A1
- Authority
- FR
- France
- Prior art keywords
- acid
- dihydroxy
- cholenic
- tri
- keto
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 4
- RUDATBOHQWOJDD-UZVSRGJWSA-N ursodeoxycholic acid Chemical compound C([C@H]1C[C@@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)CC1 RUDATBOHQWOJDD-UZVSRGJWSA-N 0.000 title description 7
- 229960001661 ursodiol Drugs 0.000 title description 7
- 239000002253 acid Substances 0.000 claims abstract description 20
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 230000007062 hydrolysis Effects 0.000 claims abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- -1 3a, 7e-dihydroxy-11-cholenic acid Chemical compound 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 239000011541 reaction mixture Substances 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 2
- 239000011260 aqueous acid Substances 0.000 claims description 2
- RPKLZQLYODPWTM-KBMWBBLPSA-N cholanoic acid Chemical compound C1CC2CCCC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@@H](CCC(O)=O)C)[C@@]1(C)CC2 RPKLZQLYODPWTM-KBMWBBLPSA-N 0.000 claims description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- RUDATBOHQWOJDD-GOIAGWKQSA-N (4r)-4-[(3r,8r,9s,10s,13r,14s,17r)-3,7-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1h-cyclopenta[a]phenanthren-17-yl]pentanoic acid Chemical compound OC1CC2C[C@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@@H](CCC(O)=O)C)[C@@]1(C)CC2 RUDATBOHQWOJDD-GOIAGWKQSA-N 0.000 claims 1
- 206010008631 Cholera Diseases 0.000 claims 1
- 229930194542 Keto Natural products 0.000 claims 1
- 125000000468 ketone group Chemical group 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 21
- 239000000203 mixture Substances 0.000 description 15
- 239000000047 product Substances 0.000 description 11
- RUDATBOHQWOJDD-UHFFFAOYSA-N (3beta,5beta,7alpha)-3,7-Dihydroxycholan-24-oic acid Natural products OC1CC2CC(O)CCC2(C)C2C1C1CCC(C(CCC(O)=O)C)C1(C)CC2 RUDATBOHQWOJDD-UHFFFAOYSA-N 0.000 description 9
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 9
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 229910001868 water Inorganic materials 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- RUDATBOHQWOJDD-BSWAIDMHSA-N chenodeoxycholic acid Chemical compound C([C@H]1C[C@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)CC1 RUDATBOHQWOJDD-BSWAIDMHSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229960001091 chenodeoxycholic acid Drugs 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000000921 elemental analysis Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- NDVMCQUOSYOQMZ-UHFFFAOYSA-N 2,2-bis(trimethylsilyl)acetamide Chemical compound C[Si](C)(C)C(C(N)=O)[Si](C)(C)C NDVMCQUOSYOQMZ-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 2
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- BHQCQFFYRZLCQQ-UHFFFAOYSA-N (3alpha,5alpha,7alpha,12alpha)-3,7,12-trihydroxy-cholan-24-oic acid Natural products OC1CC2CC(O)CCC2(C)C2C1C1CCC(C(CCC(O)=O)C)C1(C)C(O)C2 BHQCQFFYRZLCQQ-UHFFFAOYSA-N 0.000 description 1
- NEEIOMGUTSQVRZ-WNOQBHAASA-N (4r)-4-[(8r,9s,10s,13r,14s,17r)-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1h-cyclopenta[a]phenanthren-17-yl]-2,2-dihydroxypentanoic acid Chemical compound C1CC2CCCC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@@H](CC(O)(O)C(O)=O)C)[C@@]1(C)CC2 NEEIOMGUTSQVRZ-WNOQBHAASA-N 0.000 description 1
- DXOCDBGWDZAYRQ-SRILBWIPSA-N (4r)-4-[(8r,9s,10s,13r,14s,17r)-3-hydroxy-10,13-dimethyl-7-oxo-1,2,3,4,5,6,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoic acid Chemical compound C1CC(O)CC2CC(=O)[C@H]3[C@@H]4CC[C@H]([C@@H](CCC(O)=O)C)[C@@]4(C)CC[C@@H]3[C@]21C DXOCDBGWDZAYRQ-SRILBWIPSA-N 0.000 description 1
- MASDFXZJIDNRTR-UHFFFAOYSA-N 1,3-bis(trimethylsilyl)urea Chemical compound C[Si](C)(C)NC(=O)N[Si](C)(C)C MASDFXZJIDNRTR-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- PTTPXKJBFFKCEK-UHFFFAOYSA-N 2-Methyl-4-heptanone Chemical compound CC(C)CC(=O)CC(C)C PTTPXKJBFFKCEK-UHFFFAOYSA-N 0.000 description 1
- RUDATBOHQWOJDD-BYRKYSOESA-N 3a,7a-Dihydroxycholanoic acid Chemical compound C([C@H]1O)C2C[C@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@@H](CCC(O)=O)C)[C@@]1(C)CC2 RUDATBOHQWOJDD-BYRKYSOESA-N 0.000 description 1
- KPRGOTLNGIBVFL-GINZOMEDSA-N 7-ketodehydroepiandrosterone Chemical group C1[C@@H](O)CC[C@]2(C)[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3C(=O)C=C21 KPRGOTLNGIBVFL-GINZOMEDSA-N 0.000 description 1
- 239000004380 Cholic acid Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- KHMDWPNMFSMERZ-BYRKYSOESA-N O[C@H]1CC2C[C@H]([C@H]3[C@@H]4CC[C@H]([C@@H](CCC(=O)O)C)[C@]4(C=C[C@@H]3[C@]2(CC1)C)C)O Chemical compound O[C@H]1CC2C[C@H]([C@H]3[C@@H]4CC[C@H]([C@@H](CCC(=O)O)C)[C@]4(C=C[C@@H]3[C@]2(CC1)C)C)O KHMDWPNMFSMERZ-BYRKYSOESA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 1
- 244000309466 calf Species 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 201000001883 cholelithiasis Diseases 0.000 description 1
- 235000012000 cholesterol Nutrition 0.000 description 1
- BHQCQFFYRZLCQQ-OELDTZBJSA-N cholic acid Chemical compound C([C@H]1C[C@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)[C@@H](O)C1 BHQCQFFYRZLCQQ-OELDTZBJSA-N 0.000 description 1
- 229960002471 cholic acid Drugs 0.000 description 1
- 235000019416 cholic acid Nutrition 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- KXGVEGMKQFWNSR-UHFFFAOYSA-N deoxycholic acid Natural products C1CC2CC(O)CCC2(C)C2C1C1CCC(C(CCC(O)=O)C)C1(C)C(O)C2 KXGVEGMKQFWNSR-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000002934 diuretic Substances 0.000 description 1
- 230000001882 diuretic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 208000001130 gallstones Diseases 0.000 description 1
- NEXSMEBSBIABKL-UHFFFAOYSA-N hexamethyldisilane Chemical compound C[Si](C)(C)[Si](C)(C)C NEXSMEBSBIABKL-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000002444 silanisation Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07J—STEROIDS
- C07J9/00—Normal steroids containing carbon, hydrogen, halogen or oxygen substituted in position 17 beta by a chain of more than two carbon atoms, e.g. cholane, cholestane, coprostane
- C07J9/005—Normal steroids containing carbon, hydrogen, halogen or oxygen substituted in position 17 beta by a chain of more than two carbon atoms, e.g. cholane, cholestane, coprostane containing a carboxylic function directly attached or attached by a chain containing only carbon atoms to the cyclopenta[a]hydrophenanthrene skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07J—STEROIDS
- C07J51/00—Normal steroids with unmodified cyclopenta(a)hydrophenanthrene skeleton not provided for in groups C07J1/00 - C07J43/00
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Steroid Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22033/80A IT1132055B (it) | 1980-05-14 | 1980-05-14 | Processo per la preparazione di acido ursodesossicolico ad alta purezza |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2482602A1 true FR2482602A1 (fr) | 1981-11-20 |
| FR2482602B1 FR2482602B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1983-05-20 |
Family
ID=11190468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8109312A Granted FR2482602A1 (fr) | 1980-05-14 | 1981-05-11 | Procede pour la preparation d'acide ursodesoxycholique de purete elevee |
Country Status (7)
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1150756B (it) * | 1982-04-02 | 1986-12-17 | Zambon Spa | Procedimento per preparare l'acido 3alfa, 7beta-diidrossi-5beta-colanico |
| US4892868A (en) * | 1984-08-17 | 1990-01-09 | Gipharmex, S.P.A. | Derivatives of biliary acids, process for the production thereof and corresponding pharmaceutical compositions |
| DE4432708A1 (de) * | 1994-09-14 | 1996-03-21 | Hoechst Ag | Modifizierte Gallensäuren, Verfahren zu ihrer Herstellung und ihre Verwendung |
| DE19645044A1 (de) * | 1996-10-31 | 1998-05-07 | Falk Pharma Gmbh | Verwendung von Ursodeoxycholsäure zur topischen Behandlung von Entzündungserkrankungen der Schleimhäute |
| US6060465A (en) * | 1997-02-06 | 2000-05-09 | Miljkovic; Dusan | Bile acids and their derivatives as glycoregulatory agents |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1391735A (fr) * | 1963-10-17 | 1965-03-12 | Tetsuo Sato | Procédé de préparation de l'acide ursodesoxycholique |
| US3833620A (en) * | 1972-11-16 | 1974-09-03 | Intellectual Property Dev Corp | Production of chenodeoxycholic acid |
| EP0024292A1 (en) * | 1979-07-12 | 1981-03-04 | BLASCHIM S.p.A. | Process for the separation of ursodeoxycholic acid from chenodeoxycholic acid and products obtained during the process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213911A (en) * | 1978-11-07 | 1980-07-22 | Canada Packers Limited | Process for preparing high-melting chenodeoxycholic acid |
| FR2457302A1 (fr) * | 1979-05-23 | 1980-12-19 | Roussel Uclaf | Nouveau procede de purification de l'acide ursodesoxycholique |
-
1980
- 1980-05-14 IT IT22033/80A patent/IT1132055B/it active
-
1981
- 1981-04-29 US US06/258,730 patent/US4337206A/en not_active Expired - Fee Related
- 1981-05-04 DE DE19813117559 patent/DE3117559A1/de not_active Withdrawn
- 1981-05-07 CA CA000377095A patent/CA1150239A/en not_active Expired
- 1981-05-11 FR FR8109312A patent/FR2482602A1/fr active Granted
- 1981-05-13 JP JP7084981A patent/JPS579799A/ja active Granted
- 1981-05-14 GB GB8114782A patent/GB2076823B/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1391735A (fr) * | 1963-10-17 | 1965-03-12 | Tetsuo Sato | Procédé de préparation de l'acide ursodesoxycholique |
| US3833620A (en) * | 1972-11-16 | 1974-09-03 | Intellectual Property Dev Corp | Production of chenodeoxycholic acid |
| EP0024292A1 (en) * | 1979-07-12 | 1981-03-04 | BLASCHIM S.p.A. | Process for the separation of ursodeoxycholic acid from chenodeoxycholic acid and products obtained during the process |
Non-Patent Citations (2)
| Title |
|---|
| CA1980 * |
| EXBK/81 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3117559A1 (de) | 1982-04-22 |
| GB2076823B (en) | 1984-03-14 |
| IT1132055B (it) | 1986-06-25 |
| FR2482602B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1983-05-20 |
| GB2076823A (en) | 1981-12-09 |
| CA1150239A (en) | 1983-07-19 |
| JPS6355519B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1988-11-02 |
| JPS579799A (en) | 1982-01-19 |
| IT8022033A0 (it) | 1980-05-14 |
| US4337206A (en) | 1982-06-29 |
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