SU508186A3 - Способ получени -замещенных лактамов - Google Patents
Способ получени -замещенных лактамовInfo
- Publication number
- SU508186A3 SU508186A3 SU1893858A SU1893858A SU508186A3 SU 508186 A3 SU508186 A3 SU 508186A3 SU 1893858 A SU1893858 A SU 1893858A SU 1893858 A SU1893858 A SU 1893858A SU 508186 A3 SU508186 A3 SU 508186A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- hydrogen
- acid
- formula
- carbon atoms
- kip
- Prior art date
Links
- 150000003951 lactams Chemical class 0.000 title claims 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Substances CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000003342 alkenyl group Chemical group 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 125000000623 heterocyclic group Chemical group 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims 2
- 125000005907 alkyl ester group Chemical group 0.000 claims 1
- 125000000753 cycloalkyl group Chemical group 0.000 claims 1
- 150000004820 halides Chemical class 0.000 claims 1
- 229910052736 halogen Inorganic materials 0.000 claims 1
- 150000002367 halogens Chemical class 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 125000004433 nitrogen atom Chemical group N* 0.000 claims 1
- 229910017464 nitrogen compound Inorganic materials 0.000 claims 1
- 150000002830 nitrogen compounds Chemical class 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 description 13
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 10
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 8
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- GCFHZZWXZLABBL-UHFFFAOYSA-N ethanol;hexane Chemical compound CCO.CCCCCC GCFHZZWXZLABBL-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- -1 5-Methyl-2-oxopyrrolidino Chemical group 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- PRNFLFIICMGARJ-UHFFFAOYSA-N carbonochloridic acid;pyridine Chemical compound OC(Cl)=O.C1=CC=NC=C1 PRNFLFIICMGARJ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- UACOQEQOBAQRDQ-UHFFFAOYSA-N etebenecid Chemical compound CCN(CC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 UACOQEQOBAQRDQ-UHFFFAOYSA-N 0.000 description 1
- SBNKFTQSBPKMBZ-UHFFFAOYSA-N ethenzamide Chemical compound CCOC1=CC=CC=C1C(N)=O SBNKFTQSBPKMBZ-UHFFFAOYSA-N 0.000 description 1
- ZKQFHRVKCYFVCN-UHFFFAOYSA-N ethoxyethane;hexane Chemical compound CCOCC.CCCCCC ZKQFHRVKCYFVCN-UHFFFAOYSA-N 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RBBOWEDMXHTEPA-UHFFFAOYSA-N hexane;toluene Chemical compound CCCCCC.CC1=CC=CC=C1 RBBOWEDMXHTEPA-UHFFFAOYSA-N 0.000 description 1
- 150000001261 hydroxy acids Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- AJFDBNQQDYLMJN-UHFFFAOYSA-N n,n-diethylacetamide Chemical compound CCN(CC)C(C)=O AJFDBNQQDYLMJN-UHFFFAOYSA-N 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/27—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with substituted hydrocarbon radicals directly attached to the ring nitrogen atom
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pharmacology & Pharmacy (AREA)
- Neurosurgery (AREA)
- Biomedical Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Engineering & Computer Science (AREA)
- Neurology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Pyrrole Compounds (AREA)
- Hydrogenated Pyridines (AREA)
- Plural Heterocyclic Compounds (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB697870A GB1309692A (en) | 1970-02-13 | 1970-02-13 | N-substituted lactams |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU508186A3 true SU508186A3 (ru) | 1976-03-25 |
Family
ID=9824325
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1893858A SU508186A3 (ru) | 1970-02-13 | 1971-02-12 | Способ получени -замещенных лактамов |
| SU1621307A SU508185A3 (ru) | 1970-02-13 | 1971-02-12 | Способ получени -замещенных лактамов |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1621307A SU508185A3 (ru) | 1970-02-13 | 1971-02-12 | Способ получени -замещенных лактамов |
Country Status (15)
| Country | Link |
|---|---|
| JP (2) | JPS535301B1 (enExample) |
| BE (1) | BE762728R (enExample) |
| CH (1) | CH530395A (enExample) |
| CS (2) | CS167911B2 (enExample) |
| DE (1) | DE2106418C2 (enExample) |
| DK (1) | DK137451B (enExample) |
| ES (1) | ES388135A2 (enExample) |
| FI (1) | FI54916C (enExample) |
| FR (1) | FR2081508B2 (enExample) |
| GB (1) | GB1309692A (enExample) |
| MY (1) | MY7400072A (enExample) |
| NL (1) | NL168830C (enExample) |
| SU (2) | SU508186A3 (enExample) |
| YU (2) | YU34876B (enExample) |
| ZA (1) | ZA71877B (enExample) |
Families Citing this family (43)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1045043B (it) * | 1975-08-13 | 1980-04-21 | Isf Spa | Derivati pirrolidinici |
| GB1583871A (en) | 1976-10-19 | 1981-02-04 | Ucb Sa | Anti-aggregants |
| BE864269A (fr) * | 1977-03-03 | 1978-06-16 | Parke Davis & Co | Nouveaux n-(aminoalkyl substitue)-2-oxo-1-pyrrolidine-acetamides et procedes pour les produire |
| ATE27T1 (de) * | 1978-05-08 | 1981-04-15 | Ucb Sa | Lactam-n-essigsaeuren und ihre amide, verfahren zu ihrer herstellung und heilmittel, die sie enthalten |
| IT1141287B (it) * | 1979-06-13 | 1986-10-01 | Nattermann A & Cie | Ammidi di acidi pirrolidin-(2)-on-(1)-ilalchil-carbossilici,procedimento per la loro preparazione e prodotti medicinali che le contengono |
| FR2515179A1 (fr) * | 1981-07-24 | 1983-04-29 | Hoffmann La Roche | Derives de pyrrolidine, leur procede de preparation, les intermediaires pour leur synthese et leur application therapeutique |
| DE3361609D1 (en) * | 1982-03-24 | 1986-02-06 | Prodes Sa | New n-((2-oxo-1-pyrrolidinyl)acetyl)piperazines, the methods of producing such new compounds and their salts as well as pharmaceutical preparations for therapeutic use containing these compounds or salts |
| GB8412358D0 (en) * | 1984-05-15 | 1984-06-20 | Ucb Sa | Pharmaceutical composition |
| GB8412357D0 (en) * | 1984-05-15 | 1984-06-20 | Ucb Sa | Pharmaceutical composition |
| DE3420193A1 (de) * | 1984-05-30 | 1985-12-05 | Boehringer Ingelheim KG, 6507 Ingelheim | Neue substituierte pyrrolidinone, verfahren zu ihrer herstellung und arzneimittel |
| US4804400A (en) * | 1986-09-12 | 1989-02-14 | Ciba-Geigy Corporation | N-phenyl-maleimides and herbicidal and plant growth regulating methods of use thereof |
| GB8827389D0 (en) * | 1988-11-23 | 1988-12-29 | Ucb Sa | Process for preparation of(s)alpha-ethyl-2-oxo-1-pyrrolidineacetamide |
| TW544311B (en) * | 1998-08-06 | 2003-08-01 | Daiichi Seiyaku Co | Therapeutic or preventive agent for intractable epilepsies |
| GB0004297D0 (en) | 2000-02-23 | 2000-04-12 | Ucb Sa | 2-oxo-1 pyrrolidine derivatives process for preparing them and their uses |
| US6686477B2 (en) | 2000-09-29 | 2004-02-03 | Eastman Chemical Company | Highly enantiomerically pure lactam-substituted propanoic acid derivatives and methods of making and using same |
| WO2002094787A1 (en) * | 2001-05-23 | 2002-11-28 | Ucb, S.A. | 2-oxo-piperidinyl- and 2-oxo-azepanyl alkanoic acid derivativ es for the treatment of epilepsy and other neurological disorders |
| JP4334344B2 (ja) * | 2001-08-10 | 2009-09-30 | ユセベ ファルマ ソシエテ アノニム | オキソピロリジン化合物、当該化合物の調製、並びにレベチラセタム及び類似体の製造におけるその化合物の使用 |
| DE60218193T2 (de) * | 2001-10-08 | 2007-11-22 | Ucb S.A. | Verwendung von 2-oxo-1-pyrrolidin-derivaten zur herstellung eines arzneimittels zur behandlung von dyskinesia |
| CN1802352A (zh) | 2003-02-03 | 2006-07-12 | 特瓦制药工业有限公司 | 制备左乙拉西坦的方法 |
| ES2214147B1 (es) | 2003-02-28 | 2005-10-01 | Farma-Lepori S.A. | Procedimiento de obtencion de un agente antiepileptico. |
| CA2497062A1 (en) | 2004-02-18 | 2005-08-18 | Dr. Reddy's Laboratories Limited | Preparation of amino acid amides |
| CA2488325C (en) | 2004-11-22 | 2010-08-24 | Apotex Pharmachem Inc. | Improved process for the preparation of (s)-alpha-ethyl-2-oxo-1-pyrrolidineacetamide and (r)-alpha-ethyl-2-oxo-1-pyrrolidineacetamide |
| US20080146819A1 (en) * | 2005-03-10 | 2008-06-19 | Rubamin Limited | Process for Preparing Levetiracetam |
| US8178533B2 (en) | 2005-06-01 | 2012-05-15 | Ucb Pharma, S.A. | 2-oxo-1-pyrrolidine derivatives, processes for preparing them and their uses |
| EP2147911A1 (en) | 2008-07-24 | 2010-01-27 | ZaCh System S.p.A. | Process for the preparation of levetiracetam |
| EP2346500B1 (en) | 2008-10-16 | 2017-05-17 | The Johns Hopkins University | Methods and compositions for improving cognitive function |
| WO2010132693A2 (en) | 2009-05-13 | 2010-11-18 | Nektar Therapeutics | Oligomer-containing pyrrolidine compounds |
| US7939676B2 (en) | 2009-09-17 | 2011-05-10 | Zach System S.P.A. | Process for the preparation of levetiracetam |
| EP2533645B1 (en) | 2010-02-09 | 2016-07-27 | The Johns Hopkins University | Methods and compositions for improving cognitive function |
| US10154988B2 (en) | 2012-11-14 | 2018-12-18 | The Johns Hopkins University | Methods and compositions for treating schizophrenia |
| CA2904767C (en) | 2013-03-15 | 2022-06-21 | Agenebio, Inc. | Methods and compositions for improving cognitive function |
| US10806717B2 (en) | 2013-03-15 | 2020-10-20 | The Johns Hopkins University | Methods and compositions for improving cognitive function |
| PL3096790T3 (pl) | 2014-01-21 | 2020-01-31 | Janssen Pharmaceutica, N.V. | Kombinacje zawierające pozytywne modulatory allosteryczne lub agonistów ortosterycznych metabotropowego receptora glutaminergicznego podtypu 2 i ich zastosowanie |
| ME03518B (me) | 2014-01-21 | 2020-04-20 | Janssen Pharmaceutica Nv | Kombinacije koje obuhvataju pozitivne alosterične modulatore ili ortosterične agoniste metabotropnog glutamatergičnog receptora podtipa 2 i njihova primjena |
| CN104059010A (zh) * | 2014-06-12 | 2014-09-24 | 浙江华海药业股份有限公司 | 一种制备2-(2-氧代吡咯烷-1-基)-丁酸酯的方法 |
| CN106591179B (zh) * | 2016-12-05 | 2018-07-03 | 长兴制药股份有限公司 | 甲基包囊菌及其在选择性拆分制备(S)-α-乙基-2-氧-1-吡咯烷乙酸盐上的应用 |
| RU2663899C1 (ru) * | 2017-07-19 | 2018-08-13 | Федеральное государственное унитарное предприятие "Государственный научный центр "Научно-исследовательский институт органических полупродуктов и красителей" | Способ получения 1-карбамоилметил-4-фенил-2-пирролидона |
| US11384050B1 (en) | 2021-02-03 | 2022-07-12 | Vitaworks Ip, Llc | Method for preparing levetiracetam and intermediates thereof |
| US12559456B2 (en) | 2021-02-03 | 2026-02-24 | Suzhou Brighthope Pharma Tech Co., Ltd | Method for preparing levetiracetam and intermediates thereof |
| CN113979911A (zh) * | 2021-11-12 | 2022-01-28 | 汤斌 | 一种从大鲵肽中提取乙拉西坦的方法 |
| EP4572852A1 (en) | 2022-08-19 | 2025-06-25 | Agenebio, Inc. | Benzazepine derivatives, compositions, and methods for treating cognitive impairment |
| US12590059B2 (en) | 2023-03-28 | 2026-03-31 | Suzhou Brighthope Pharmatech Co., Ltd | Process for the production of levetiracetam |
| US12528770B2 (en) | 2023-06-12 | 2026-01-20 | Suzhou Brighthope Pharmatech Co., Ltd. | Process for the production of levetiracetam and intermediates thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1039113A (en) * | 1964-08-06 | 1966-08-17 | Ucb Sa | New n-substituted lactams |
-
1970
- 1970-02-13 GB GB697870A patent/GB1309692A/en not_active Expired
-
1971
- 1971-02-08 FR FR7104195A patent/FR2081508B2/fr not_active Expired
- 1971-02-09 NL NLAANVRAGE7101697,A patent/NL168830C/xx not_active IP Right Cessation
- 1971-02-10 CS CS987A patent/CS167911B2/cs unknown
- 1971-02-10 DK DK59571AA patent/DK137451B/da not_active IP Right Cessation
- 1971-02-10 BE BE762728A patent/BE762728R/xx active
- 1971-02-10 YU YU306/71A patent/YU34876B/xx unknown
- 1971-02-10 FI FI383/71A patent/FI54916C/fi active
- 1971-02-10 ES ES388135A patent/ES388135A2/es not_active Expired
- 1971-02-11 CH CH200171A patent/CH530395A/fr not_active IP Right Cessation
- 1971-02-11 ZA ZA710877A patent/ZA71877B/xx unknown
- 1971-02-11 DE DE2106418A patent/DE2106418C2/de not_active Expired
- 1971-02-12 SU SU1893858A patent/SU508186A3/ru active
- 1971-02-12 SU SU1621307A patent/SU508185A3/ru active
- 1971-02-12 JP JP612471A patent/JPS535301B1/ja active Pending
- 1971-12-10 CS CS140674A patent/CS167912B2/cs unknown
-
1974
- 1974-12-31 MY MY197472A patent/MY7400072A/xx unknown
-
1977
- 1977-11-07 JP JP13335277A patent/JPS53130656A/ja active Granted
-
1978
- 1978-06-19 YU YU01445/78A patent/YU144578A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA71877B (en) | 1971-10-27 |
| DE2106418A1 (de) | 1971-08-19 |
| FI54916C (fi) | 1979-04-10 |
| NL7101697A (enExample) | 1971-08-17 |
| MY7400072A (en) | 1974-12-31 |
| JPS53130656A (en) | 1978-11-14 |
| CS167912B2 (enExample) | 1976-05-28 |
| NL168830B (nl) | 1981-12-16 |
| YU144578A (en) | 1982-10-31 |
| DK137451C (enExample) | 1978-07-24 |
| JPS535301B1 (enExample) | 1978-02-25 |
| CH530395A (fr) | 1972-11-15 |
| JPS5420491B2 (enExample) | 1979-07-23 |
| ES388135A2 (es) | 1973-05-01 |
| FR2081508B2 (enExample) | 1975-06-06 |
| GB1309692A (en) | 1973-03-14 |
| YU34876B (en) | 1980-04-30 |
| CS167911B2 (enExample) | 1976-05-28 |
| YU30671A (en) | 1979-10-31 |
| DE2106418C2 (de) | 1983-12-22 |
| DK137451B (da) | 1978-03-06 |
| BE762728R (fr) | 1971-08-10 |
| NL168830C (nl) | 1982-05-17 |
| SU508185A3 (ru) | 1976-03-25 |
| FR2081508A2 (enExample) | 1971-12-03 |
| FI54916B (fi) | 1978-12-29 |
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