DK151889A - Bis-(hydroxymethyl)-cyclobutyl-puriner og -pyrimidiner samt fremgangsmaade til deres fremstilling - Google Patents

Bis-(hydroxymethyl)-cyclobutyl-puriner og -pyrimidiner samt fremgangsmaade til deres fremstilling

Info

Publication number
DK151889A
DK151889A DK151889A DK151889A DK151889A DK 151889 A DK151889 A DK 151889A DK 151889 A DK151889 A DK 151889A DK 151889 A DK151889 A DK 151889A DK 151889 A DK151889 A DK 151889A
Authority
DK
Denmark
Prior art keywords
pyrimidines
hydroxymethyl
bis
procedures
preparation
Prior art date
Application number
DK151889A
Other languages
English (en)
Other versions
DK170749B1 (da
DK151889D0 (da
Inventor
William A Slusarchyk
Robert Zahler
Original Assignee
Squibb & Sons Inc
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 Squibb & Sons Inc filed Critical Squibb & Sons Inc
Publication of DK151889D0 publication Critical patent/DK151889D0/da
Publication of DK151889A publication Critical patent/DK151889A/da
Application granted granted Critical
Publication of DK170749B1 publication Critical patent/DK170749B1/da

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D473/00—Heterocyclic compounds containing purine ring systems
    • C07D473/02—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6
    • C07D473/18—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 one oxygen and one nitrogen atom, e.g. guanine
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/52—Two oxygen atoms
    • C07D239/54—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/20—Antivirals for DNA viruses
    • A61P31/22—Antivirals for DNA viruses for herpes viruses
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C35/00—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring
    • C07C35/02—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring monocyclic
    • C07C35/04—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring monocyclic containing a three or four-membered rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/50—Three nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/52—Two oxygen atoms
    • C07D239/54—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals
    • C07D239/545—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals with other hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/52—Two oxygen atoms
    • C07D239/54—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals
    • C07D239/545—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals with other hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/553—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals with other hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms with halogen atoms or nitro radicals directly attached to ring carbon atoms, e.g. fluorouracil
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D473/00—Heterocyclic compounds containing purine ring systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Virology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Oncology (AREA)
  • Veterinary Medicine (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Public Health (AREA)
  • Communicable Diseases (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Saccharide Compounds (AREA)
DK151889A 1988-03-30 1989-03-29 1-Pyrimidin-, 9-purin- eller 9-(8-azapurin)-forbindelser, fremgangsmåde til deres fremstilling samt ved fremgangsmåden anvendelige cyclobytanolderivater DK170749B1 (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17537688A 1988-03-30 1988-03-30
US17537688 1988-03-30

Publications (3)

Publication Number Publication Date
DK151889D0 DK151889D0 (da) 1989-03-29
DK151889A true DK151889A (da) 1989-10-01
DK170749B1 DK170749B1 (da) 1996-01-08

Family

ID=22640016

Family Applications (1)

Application Number Title Priority Date Filing Date
DK151889A DK170749B1 (da) 1988-03-30 1989-03-29 1-Pyrimidin-, 9-purin- eller 9-(8-azapurin)-forbindelser, fremgangsmåde til deres fremstilling samt ved fremgangsmåden anvendelige cyclobytanolderivater

Country Status (31)

Country Link
US (1) US5723609A (da)
EP (1) EP0335355B1 (da)
JP (1) JP2694999B2 (da)
KR (1) KR970009223B1 (da)
CN (1) CN1031054C (da)
AR (1) AR247395A1 (da)
AT (1) ATE158797T1 (da)
AU (2) AU616494B2 (da)
BR (1) BR1100660A (da)
CA (1) CA1341201C (da)
CZ (1) CZ278493B6 (da)
DD (1) DD280325A5 (da)
DE (1) DE68928353T2 (da)
DK (1) DK170749B1 (da)
EG (1) EG18734A (da)
ES (1) ES2109218T3 (da)
FI (1) FI96420C (da)
GR (1) GR3025693T3 (da)
HU (1) HU203734B (da)
IE (1) IE81079B1 (da)
IL (1) IL89796A (da)
MX (1) MX15464A (da)
NO (1) NO168423C (da)
NZ (1) NZ228490A (da)
PH (1) PH26562A (da)
PL (1) PL158539B1 (da)
PT (1) PT90159B (da)
RU (2) RU2041213C1 (da)
SK (1) SK193489A3 (da)
YU (1) YU63789A (da)
ZA (1) ZA892185B (da)

Families Citing this family (42)

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US5597824A (en) * 1987-11-03 1997-01-28 Abbott Laboratories Analogs of oxetanyl purines and pyrimidines
AU622926B2 (en) * 1988-09-09 1992-04-30 Nippon Kayaku Kabushiki Kaisha Pyrimidine or purine cyclobutane derivatives
JP2577640B2 (ja) * 1988-09-09 1997-02-05 日本化薬株式会社 新規なシクロブタン誘導体
US5153352A (en) * 1988-10-25 1992-10-06 Bristol-Myers Squibb Company Process for preparation of intermediates of carbocyclic nucleoside analogs
US5246931A (en) * 1988-10-25 1993-09-21 Bristol-Myers Squibb Company Carbocyclic nucleoside analogs
IL92096A0 (en) 1988-10-25 1990-07-12 Abbott Lab Carboxylic nucleoside analogs
NZ232993A (en) * 1989-04-24 1992-10-28 Squibb & Sons Inc Purinyl and pyrimidinyl tetrahydrofurans
US5059690A (en) * 1990-03-01 1991-10-22 E. R. Squibb & Sons, Inc. Purinyl tetrahydrofurans
US5145960A (en) * 1989-04-24 1992-09-08 E. R. Squibb & Sons, Inc. Pyrimidinyl tetrahydrofurans
US5164520A (en) * 1989-04-24 1992-11-17 E. R. Squibb & Sons, Inc. Intermediates for purinyl and pyrimidinyl tetrahydrofurans
JPH03173896A (ja) * 1989-09-08 1991-07-29 Nippon Kayaku Co Ltd 新規オキセタノシン誘導体、その塩およびその用途
US5064961A (en) * 1989-12-18 1991-11-12 E. R. Squibb & Sons, Inc. Process for preparing an optically active cyclobutane nucleoside
US5256806A (en) * 1989-12-18 1993-10-26 E. R. Squibb & Sons, Inc. Intermediates for the preparation of optically active cyclobutane nucleoside
US5198583A (en) * 1989-12-18 1993-03-30 E. R. Squibb & Sons, Inc. Optically active cyclobutane nucleoside and intermediates, therefor
US5352669A (en) * 1990-03-13 1994-10-04 The Of The United States Of America As Represented By The Department Of Health And Human Services O6 -benzylated guanine, guanosine and 2'-deoxyguanosine compounds possessing O6 -alkylguanine-DNA alkyltransferase depleting activity
US5691307A (en) * 1990-03-13 1997-11-25 The United States Of America As Represented By The Department Of Health And Human Services O6 -substituted guanine compositions and methods for depleting O6
US5235052A (en) * 1990-04-16 1993-08-10 Bristol-Myers Squibb Company Process for preparing substituted cyclobutane purines
JPH0421682A (ja) * 1990-05-11 1992-01-24 Asahi Chem Ind Co Ltd ２―フルオロネプラノシンａおよびその製造法
AU635642B2 (en) * 1990-05-24 1993-03-25 E.R. Squibb & Sons, Inc. Fluorinated bis(hydroxymethyl) cyclobutyl purines and pyrimidines
US5324730A (en) * 1990-05-24 1994-06-28 Nippon Kayaku Kabushiki Kaisha Phenoxyphosphoryloxymethyl cyclobutyl purines
US5233076A (en) * 1990-05-24 1993-08-03 E. R. Squibb & Sons, Inc. Process for preparing an optically active cyclobutanone, an intermediate in the synthesis of an optically active cyclobutane nucleoside
IE72143B1 (en) * 1990-05-24 1997-03-26 Squibb & Sons Inc Process for preparing an optically active cyclobutanone an intermediate in the synthesis of an optically active cyclobutane nucleoside
US5344962A (en) * 1990-05-24 1994-09-06 E. R. Squibb & Sons, Inc. Intermediates in the synthesis of an optically active cyclobutane nucleoside
EP0468352A3 (en) * 1990-07-24 1992-07-15 Nippon Kayaku Kabushiki Kaisha Novel nucleic acid derivatives
CA2052315A1 (en) * 1990-10-09 1992-04-10 Masashi Nagai Cyclobutane derivatives
USH1142H (en) * 1990-11-05 1993-02-02 Optically active cyclobutyl pyrimidine
US5237095A (en) * 1991-10-02 1993-08-17 E. R. Squibb & Sons, Inc. Process for the preparation of an antiviral agent
US5185463A (en) * 1991-10-02 1993-02-09 E. R. Squibb & Sons, Inc. Process for the preparation of an antiviral agent
US5218142A (en) * 1991-10-02 1993-06-08 E. R. Squibb & Sons, Inc. Process for the preparation of an antiviral agent
US5233086A (en) * 1991-10-02 1993-08-03 E. R. Squibb & Sons, Inc. Intermediates for the preparation of an antiviral agent
US5237096A (en) * 1991-10-02 1993-08-17 E. R. Squibb & Sons, Inc. Process for the preparation of an antiviral agent
US5525726A (en) * 1991-10-02 1996-06-11 E. R. Squibb & Sons, Inc. Process for the preparation of an antiviral agent
DE4142568A1 (de) * 1991-12-21 1993-06-24 Basf Ag Verfahren zur herstellung von 2,4,5-triamino-6-halogenopyrimidinen und 2-amino-6-halogenopurinen
EP0554025A3 (en) * 1992-01-27 1993-11-18 Squibb & Sons Inc Fluorinated cyclobutyl purines and pyrimidines
US5412134A (en) * 1992-05-26 1995-05-02 E. R. Squibb & Sons, Inc. Process for preparing diprotected 2,3-hydroxymethyl cyclobutanol
GB9220585D0 (en) * 1992-09-30 1992-11-11 Smithkline Beecham Plc Pharmaceuticals
US5525606A (en) 1994-08-01 1996-06-11 The United States Of America As Represented By The Department Of Health And Human Services Substituted 06-benzylguanines and 6(4)-benzyloxypyrimidines
KR970705394A (ko) * 1994-09-06 1997-10-09 다께다 가즈히코 연고제 (an ointment preparation)
IL117574A0 (en) * 1995-04-03 1996-07-23 Bristol Myers Squibb Co Processes for the preparation of cyclobutanone derivatives
WO1998052930A1 (fr) * 1997-05-20 1998-11-26 Nippon Kayaku Kabushiki Kaisha Nouveaux derives de cyclobutane et leur procede de production
US6060458A (en) * 1998-02-13 2000-05-09 The United States Of America As Represented By The Department Of Health And Human Services Oligodeoxyribonucleotides comprising O6 -benzylguanine and their use
KR20130137251A (ko) * 2008-11-27 2013-12-16 고쿠리츠다이가쿠호우징 카가와다이가쿠 시클로부틸 푸린 유도체, 혈관신생 촉진제, 관강 형성 촉진제, 신경세포 성장 촉진제 및 의약품

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US4177348A (en) * 1977-12-13 1979-12-04 United States Government Carbocyclic analogs of cytosine nucleosides
US4232154A (en) * 1977-12-13 1980-11-04 United States Of America Carbocyclic analogs of cytosine nucleosides exhibiting antiviral and antineoplasticactivity
US4617304A (en) * 1984-04-10 1986-10-14 Merck & Co., Inc. Purine derivatives
US4801710A (en) * 1984-10-26 1989-01-31 Merck & Co., Inc. Regioselective synthesis of 9-substituted purine acyclonucleoside derivatives
EP0184473A1 (en) * 1984-10-26 1986-06-11 Merck & Co. Inc. Regioselective synthesis of 9-substituted purine acyclonucleoside derivatives
US4743689A (en) * 1984-11-20 1988-05-10 Nippon Kayaku Kabushiki Kaisha Antibiotic derivative of adenine
IN164556B (da) * 1986-03-06 1989-04-08 Takeda Chemical Industries Ltd
JPS62208295A (ja) * 1986-03-07 1987-09-12 Nippon Kayaku Co Ltd ヒポキサンチン塩基を有する新規化合物およびその製造法
US4782062A (en) * 1987-05-11 1988-11-01 Merck & Co., Inc. 9-(2-hydroxymethyl)cycloalkylmethyl) guanines
US4855466A (en) * 1987-12-28 1989-08-08 E. R. Squibb & Sons, Inc. Purinyl cyclobutanes
AU622926B2 (en) * 1988-09-09 1992-04-30 Nippon Kayaku Kabushiki Kaisha Pyrimidine or purine cyclobutane derivatives
IL92096A0 (en) * 1988-10-25 1990-07-12 Abbott Lab Carboxylic nucleoside analogs
AU4378589A (en) * 1988-10-25 1990-05-03 Bristol-Myers Squibb Company Carbocyclic nucleoside analogs
US4918075A (en) * 1988-12-20 1990-04-17 E. R. Squibb & Sons, Inc. Purinyl and pyrimidinyl cyclobutanes and their use as antiviral agents
US5064961A (en) * 1989-12-18 1991-11-12 E. R. Squibb & Sons, Inc. Process for preparing an optically active cyclobutane nucleoside

Also Published As

Publication number Publication date
IL89796A (en) 1993-01-31
FI891492A (fi) 1989-10-01
RU2055076C1 (ru) 1996-02-27
JP2694999B2 (ja) 1997-12-24
PT90159B (pt) 1994-11-30
PT90159A (pt) 1989-11-10
DD280325A5 (de) 1990-07-04
ES2109218T3 (es) 1998-01-16
FI96420C (fi) 1996-06-25
CN1036575A (zh) 1989-10-25
PL278545A1 (en) 1989-10-02
NO891322L (no) 1989-10-02
KR890014544A (ko) 1989-10-24
RU2041213C1 (ru) 1995-08-09
NO891322D0 (no) 1989-03-29
DK170749B1 (da) 1996-01-08
PL158539B1 (pl) 1992-09-30
FI891492A0 (fi) 1989-03-29
GR3025693T3 (en) 1998-03-31
EP0335355A2 (en) 1989-10-04
NO168423B (no) 1991-11-11
SK278165B6 (en) 1996-02-07
AR247395A1 (es) 1994-12-29
AU8162591A (en) 1991-10-31
AU616494B2 (en) 1991-10-31
EG18734A (en) 1994-06-30
JPH026478A (ja) 1990-01-10
YU63789A (en) 1990-08-31
IL89796A0 (en) 1989-09-28
ZA892185B (en) 1989-11-29
CN1031054C (zh) 1996-02-21
KR970009223B1 (ko) 1997-06-09
AU3227689A (en) 1989-10-05
ATE158797T1 (de) 1997-10-15
HUT49592A (en) 1989-10-30
MX15464A (es) 1993-12-01
FI96420B (fi) 1996-03-15
DE68928353T2 (de) 1998-04-09
DE68928353D1 (de) 1997-11-06
EP0335355A3 (en) 1991-11-13
IE890969L (en) 1989-09-30
HU203734B (en) 1991-09-30
BR1100660A (pt) 2000-03-14
AU630570B2 (en) 1992-10-29
SK193489A3 (en) 1996-02-07
US5723609A (en) 1998-03-03
NZ228490A (en) 1990-11-27
CZ193489A3 (en) 1993-08-11
CZ278493B6 (en) 1994-02-16
DK151889D0 (da) 1989-03-29
PH26562A (en) 1992-08-19
CA1341201C (en) 2001-03-06
IE81079B1 (en) 2000-02-23
EP0335355B1 (en) 1997-10-01
NO168423C (no) 1992-02-19

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