DE2365999A1 - CYCLOPENTANES FOR THE PRODUCTION OF 15 SUBSTITUTE OMEGA-PENTANOR PROSTAGLANDINES - Google Patents

CYCLOPENTANES FOR THE PRODUCTION OF 15 SUBSTITUTE OMEGA-PENTANOR PROSTAGLANDINES

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DE2365999A1
DE2365999A1 DE2365999A DE2365999A DE2365999A1 DE 2365999 A1 DE2365999 A1 DE 2365999A1 DE 2365999 A DE2365999 A DE 2365999A DE 2365999 A DE2365999 A DE 2365999A DE 2365999 A1 DE2365999 A1 DE 2365999A1
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radical
phenyl
lower alkyl
biphenyl
cyclopentanes
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Jasjit Singh Bindra
Michael Ross Johnson
Thomas Ken Schaaf
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Pfizer Inc
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Pfizer Inc
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D333/00Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/02Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
    • C07D333/04Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
    • C07D333/06Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
    • C07D333/24Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C405/00Compounds containing a five-membered ring having two side-chains in ortho position to each other, and having oxygen atoms directly attached to the ring in ortho position to one of the side-chains, one side-chain containing, not directly attached to the ring, a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, and the other side-chain having oxygen atoms attached in gamma-position to the ring, e.g. prostaglandins ; Analogues or derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D307/00Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/34Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D307/38Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D307/54Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D309/00Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
    • C07D309/02Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
    • C07D309/08Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no 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, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D309/10Oxygen atoms
    • C07D309/12Oxygen atoms only hydrogen atoms and one oxygen atom directly attached to ring carbon atoms, e.g. tetrahydropyranyl ethers
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D317/00Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D317/08Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
    • C07D317/44Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D317/46Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
    • C07D317/48Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
    • C07D317/50Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to atoms of the carbocyclic ring
    • C07D317/54Radicals substituted by oxygen atoms
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    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02Phosphorus compounds
    • C07F9/28Phosphorus compounds with one or more P—C bonds
    • C07F9/54Quaternary phosphonium compounds
    • C07F9/5407Acyclic saturated phosphonium compounds

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  • Molecular Biology (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Heterocyclic Compounds Containing Sulfur Atoms (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Furan Compounds (AREA)
  • Pyrane Compounds (AREA)

Description

BEIL, WOLFF & BEIL 22. Nov. 1978BEIL, WOLFF & BEIL Nov 22, 1978

RECHTSANWÄLTELAWYERS

ADELONSTRASSE 58 2365993ADELONSTRASSE 58 2365993

FRANKFURT AM MAIN 80FRANKFURT AM MAIN 80

Unsere Nr. 20 757 Pr/brOur no. 20 757 Pr / br

Pfizer Inc.
New York, N.Y.,V.St.A.
Pfizer Inc.
New York, NY, V.St.A.

Cyclopentane zur Herstellung von 15-substituierten-(u-Pentanorprostaglandinen Cyclopentanes for the production of 15-substituted- (u-Pentanorprostaglandinen

Die Erfindung betrifft bestimmte Cyclopentanzwischenprodukte, die sich zur Herstellung neuer Analoge der natürlichen Prostaglandine eignen. Insbesondere betrifft sie Zwischenprodukte, die sich zur Herstellung neuer 15-substituierter u)-Pentanorprostaglandine eignen.The invention relates to certain cyclopentane intermediates, which can be used to produce new analogs of natural prostaglandins suitable. In particular, it relates to intermediates which can be used to prepare new 15-substituted u) -pentanorprostaglandins suitable.

Die erfindungsgemäßen Verbindungen besitzen folgende allgemeine FormelThe compounds according to the invention have the following general formula

H · ■ · .-■/""■■.H · ■ · .- ■ / "" ■■.

THPÖ* ' . IV THPÖ * '. IV

709819/0998709819/0998

worin A einen Rest der Formel Ar-(CH2) - oder -(CH2) -OR , wobei η eine ganze Zahl von 0 bis 5»wherein A is a radical of the formula Ar- (CH 2 ) - or - (CH 2 ) -OR, where η is an integer from 0 to 5 »

m eine ganze Zahl von 1 bis M,m is an integer from 1 to M,

R einen Niederalkylrest undR is a lower alkyl radical and

Ar einen α- oder ß-Furylrest, einen α- oder ß-Thienylrest, einen α- oder ß-Naphthylrest, einen Phenylrest, einen 3,4-Dimethoxyphenylrest, einen 3»1*-Methylendioxyphenyl- ' rest, einen 3,4,5-Trimethoxyphenylrest oder einen monosubstituierten Phenylrest bedeuten, wobei der Substituent ein Halogenatom, einen Trifluormethylrest, einen Phenylrest , einen Niederalkylrest oder einen Niederalkoxyrest darstellt, nu Ar is an α- or ß-furyl radical, an α- or ß-thienyl radical, an α- or ß-naphthyl radical, a phenyl radical, a 3,4-dimethoxyphenyl radical, a 3 » 1 * -methylenedioxyphenyl radical, a 3,4 , 5-trimethoxyphenyl radical or a monosubstituted phenyl radical, where the substituent represents a halogen atom, a trifluoromethyl radical, a phenyl radical, a lower alkyl radical or a lower alkoxy radical, nu

M = O, <- n oder ζ ,M = O, <- n or ζ,

^H %H -^ H % H -

W eine Einfachbindung oder eine Cis-Doppelbindung, Z eine Einfachbindung oder eine Trans-Doppelbindung, THP einen Tetrahydropyranylrest,W is a single bond or a cis double bond, Z is a single bond or a trans double bond, THP is a tetrahydropyranyl radical,

R1 einen p-Biphenylrest undR 1 is a p-biphenyl radical and

R ein Wasserstoffatom oder einen Niederalkylrest bedeuten.R represents a hydrogen atom or a lower alkyl radical.

Insbesondere betrifft die Erfindung Verbindungen der allgemeinen FormelIn particular, the invention relates to compounds of the general formula

THPOTHPO

709819/0998709819/0998

eine Verbindung der Formel:
HO
: W
a compound of the formula:
HO
: W

THPOTHPO

THPOTHPO

und eine Verbindung der Formel:and a compound of the formula:

THPOTHPO

worin A, R, Z, W, THP und R1 vorstehende Bedeutung haben.wherein A, R, Z, W, THP and R 1 have the preceding meaning.

Der Ausdruck "Prostaglandin der O-Reihe", beispielsweise PGEQ, bezieht sich auf Prostaglandin, worin die 5-6 und 13-1** Doppelbindungen gesättigt sind; d.h. PGEQ ist 5-6, 13-14, Tetrahydro PGEp· Außerdem beziehen sich im vorliegenden die Ausdrücke "1-Reihe" oder "2-Reihe" auf den Grad der ünsättigung in den Seitenketten.The term "O-series prostaglandin", for example PGE Q , refers to prostaglandin in which the 5-6 and 13-1 ** double bonds are saturated; ie PGE Q is 5-6, 13-14, Tetrahydro PGEp · In addition, as used herein, the terms "1-series" or "2-series" relate to the degree of unsaturation in the side chains.

Die erfindungsgemäßen p-Biphenylester lassen sich auf mehrere verschiedene Weisen herstellen. Diese unterscheiden sich untereinander dadurch, daß der p-Biphenylrest mit dem Prostaglandinvorläufer in unterschiedlichen Synthesestufen verknüpft wird.The p-biphenyl esters according to the invention can be divided into several create different ways. These differ from one another in that the p-biphenyl radical is linked to the prostaglandin precursor is linked in different synthesis stages.

7098 19/09987098 19/0998

-Jf--Jf-

Beispielsweise zeigt Schema A verschiedene Wege, die zu den p-Biphenylestern (PBE) führen.For example, Scheme A shows various routes leading to the p-biphenyl esters (PBE).

In jedem Falle wird die p-Biphenylgruppe durch Veresterung eingeführt, die am einfachsten dadurch erfolgt, daß man de^ri- entsprechenden frostaglandinvorläufer ■·..-. mit etwa 1 bis 10 Mol p-Phenylphenol in Gegenwart von 1 bis 2 Mol Dicyclohexyl carbodiimid in einem reaktionsinerten Lösungsmittel, typischerweise Methylenchlorid, behandelt. Es kann jedes Prostaglandinanalog als Substrat für die vorstehend genannte Veresterung verwendet werden, wie es im Schema A erläutert wird.In each case the p-biphenyl group is introduced by esterification, The easiest way to do this is to use the corresponding frostaglandin precursors ■ · ..-. with about 1 to 10 moles of p-phenylphenol in the presence of 1 to 2 moles of dicyclohexyl carbodiimide in a reaction inert solvent, typically methylene chloride. Anyone can do it Prostaglandin analog can be used as a substrate for the above-mentioned esterification, as illustrated in Scheme A.

Beispielsweise kann 9 durch vorstehend beschriebene VeresterungFor example, 9 can be obtained by esterification described above

dann in 9 PBE umgewandelt werden und 9 PBE kann/in 10 PBE umgewandelt werden. .then converted to 9 PFU and 9 PFU can / converted to 10 PFU will. .

SCHEMA ASCHEME A

- OH - OH

1^0' THPd' VR 1 ^ 0 'THPd' VR

$ PBS $ PBS

709819/0998709819/0998

-S--S-

Wie aus vorstehendem ersichtlich ist, können die p-Biphenylester.j wie 9 PBE und 10 PBE, als Substrate für die verschiedenen vorstehend beschriebenen Reduktionsscheinen zur Herstellung der Prostaglandinanaloge der 1- und 2-Reihe verwendet werden, um den entsprechenden p-Biphenylester der 1- und 2-Reihe herzustellen.As can be seen from the above, the p-Biphenylester.j such as 9 PFU and 10 PFU, as substrates for the various above described reduction coupons for the preparation of the prostaglandin analogs of the 1 and 2 series can be used to the corresponding To produce p-biphenyl esters of the 1- and 2-series.

Die Tetrahydropyranylgruppen lassen sich durch saure Hydrolyse entfernen. Es kann jede Säure verwendet werden, die keine Zersetzung des Moleküls im Laufe der Entfernung der Schutzgruppen verursacht» jedoch wird meistens 65#ige wäßrige Essigsäure verwendet. Das Produkt wird nach bekannten Verfahren gereinigt.The tetrahydropyranyl groups can be removed by acid hydrolysis. Any acid that does not decompose can be used of the molecule in the course of the removal of the protective groups but usually 65% aqueous acetic acid is used. The product is purified according to known methods.

Falls in den vorstehenden Verfahren die Reinigung durch Chromatographie erwünscht ist, lassen sich als geeignete Chromatographierträgerstoffe neutrale Tonerde und Silicagel verwenden, wobei Silicagel mit einer Körnchengröße von 7 4 bis 250 u im allgemeinen bevorzugt wird. Die Chromatographie wird zweckmäßigerweise in reaktionsinerten Lösungsmitteln, wie Äther, Äthylacetat, Benzol, Chloroform, Methylenchlorid, Cyclohexan oder η-Hexan, durchgeführt, wie in den nachfolgenden Beispielen erläutert wird.If in the above procedure purification by chromatography is desired, can be used as suitable chromatography carriers Use neutral clay and silica gel, with silica gel having a grain size of 7 4 to 250 u in general is preferred. The chromatography is expediently carried out in inert solvents such as ether, ethyl acetate, benzene, chloroform, methylene chloride, cyclohexane or η-hexane, as explained in the following examples.

Nachstehende Beispiele dienen der weiteren Erläuterung der Erfindung. In diesen Beispielen sind sämtliche Temperaturen in C angegeben und sämtliche Schmelz- und Siedepunkte sind nicht korrigiert. Weitere Beispiele für Synthesen von Prostaglandinanalogen, aus denen die erfindungsgemäßen p-Biphenylester hergestellt werden, werden in den Patentanmeldungen P 23 87 813 und P 23 34 9^5 beschrieben.The following examples serve to further illustrate the invention. In these examples all temperatures are given in C and all melting and boiling points are not corrected. Further examples of syntheses of prostaglandin analogs, from which the p-biphenyl esters according to the invention are produced are disclosed in patent applications P 23 87 813 and P 23 34 9 ^ 5.

709819/0998709819/0998

Be is p ie 1.1For example 1.1

p-Biphenyl-9-oxo-lla,l5a-bis-(tetrahydropyran-2-yloxy)-l6-phenyl-cis-5-trans-13-u)-tetranorprostadienoat p-Biphenyl-9-oxo-IIIa, 15a-bis (tetrahydropyran-2-yloxy) -16-phenyl-cis-5-trans-13-u) -tetranorprostadienoate

Eine Lösung von 9-Oxo-lla,15a-bis-(tetrahydropyran-2-yloxy)-l6-phenyl-cis-5-trans-13-u)-tetranorprostadiensäure (10a)
(1 Äquivalent), p-Phenylphenol (10 Äquivalente) und Dicyclohexylcarbodiimid (1,25 Äquivalente) in Methylenchlorid wurde über
Nacht gerührt, eingeengt (im Vakuum) und durch Säulenchromatographie gereinigt, wobei p-Biphenyl-9-oxo-lla,15a-bis-(tetrahydropyran-2-yloxy)-l6-phenyl-cis-5-trans-13-«)-tetranorprostadienoat erhalten wurde.
A solution of 9-oxo-lla, 15a-bis (tetrahydropyran-2-yloxy) -l6-phenyl-cis-5-trans-13-u) -tetranorprostadienäure (10a)
(1 equivalent), p-phenylphenol (10 equivalents) and dicyclohexylcarbodiimide (1.25 equivalents) in methylene chloride was over
Stirred overnight, concentrated (in vacuo) and purified by column chromatography, p-biphenyl-9-oxo-IIIa, 15a-bis (tetrahydropyran-2-yloxy) -16-phenyl-cis-5-trans-13- «) tetranorprostadienoate was obtained.

Beispiel 2Example 2

p-Biphenyl-9a-hydroxy-lla,l5a-bis-(tetrahydropyran.-2-yloxy)-l6-phenyl-cis-5-trans-13-o)-tetranorprostadienoat p-Biphenyl-9a-hydroxy-lla, l5a-bis (tetrahydropyran.-2-yloxy) -16-phenyl-cis-5-trans-13-o) -tetranorprostadienoate

Eine Lösung von einem Äquivalent 9a-Hydroxy-lla,15a-bis-(tetrahydropyran-2-yloxy)-l6-phenyl-cis-5-trans-13-tt)-tetranorpro3tadiensäure (9a), 10 Äquivalenten p-Phenylphenol und 1,25 Äquivalenten Dicyclohexylcarbodiimid in Methylenchlorid wurde über Nacht
gerührt, im Vakuum konzentriert und durch Säulenchromatographie gereinigt, wobei p-Biphenyl-9a-hydroxy-lla,15a-bis-(tetrahydropyran-2-yloxy)-l6-phenyl-cis-5-trans-13-u)-tetranorprostadienoat erhalten wurde.
A solution of one equivalent of 9a-hydroxy-IIIa, 15a-bis (tetrahydropyran-2-yloxy) -16-phenyl-cis-5-trans-13-tt) -tetranorpro3tadienoic acid (9a), 10 equivalents of p-phenylphenol and 1 .25 equivalents of dicyclohexylcarbodiimide in methylene chloride was left overnight
stirred, concentrated in vacuo and purified by column chromatography, p-biphenyl-9a-hydroxy-IIIa, 15a-bis (tetrahydropyran-2-yloxy) -16-phenyl-cis-5-trans-13-u) -tetranorprostadienoate being obtained became.

709819/0998709819/0998

Claims (1)

Patentanspruch:Claim: Verbindung der allgemeinen Formel:
M
Compound of the general formula:
M.
THPO»THPO » OR1 OR 1 THPOTHPO IVIV worin A einen Rest der Formel Ar-(CH2) - oder ""
wobei η eine ganze Zahl von 0 bis 5»
wherein A is a radical of the formula Ar- (CH 2 ) - or ""
where η is an integer from 0 to 5 »
m eine ganze Zahl von 1 bis 49 R einen Niederalkylrest undm is an integer from 1 to 4 9 R is a lower alkyl radical and Ar einen α- oder ß-Furylrest, einen α- oder ß-Thienylrest, einen α- oder ß-Naphthylrest-, einen Phenylrest, einen
3,4-Dimethoxyphenylrest, einen S^-Methylendioxyphenylrest, einen 3,4,5-Trimethoxyphenylrest oder einen monosubstituierten Phenylrest bedeuten, wobei der Substituent ein Halogenatom, einen Trifluormethylrest, einen Phenylrest, einen Niederalkylrest oder einen Niederalkoxyrest
Ar is an α- or ß-furyl radical, an α- or ß-thienyl radical, an α- or ß-naphthyl radical, a phenyl radical, a
3,4-Dimethoxyphenyl radical, an S ^ -Methylenedioxyphenylrest, a 3,4,5-Trimethoxyphenylrest or a monosubstituted phenyl radical, wherein the substituent is a halogen atom, a trifluoromethyl radical, a phenyl radical, a lower alkyl radical or a lower alkoxy radical
darstellt,represents M = O,M = O, nHnH oderor W eine Einfachbindung oder eine Cis'-Doppelbindung,W is a single bond or a cis' double bond, Z eine Einfachbindung oder eine Trans-Doppelbindung;Z is a single bond or a trans double bond; THP einen Tetrahydropyranylrest, R1 einen p-Biphenylrest undTHP is a tetrahydropyranyl radical, R 1 is a p-biphenyl radical and R ein Wasserstoffatom oder einen Niederalkylrest bedeuten.R represents a hydrogen atom or a lower alkyl radical. Für: Pfizer Inc.For: Pfizer Inc. New Yoflk, MV?., V.St.A.New Yoflk, MV?., V.St.A. 709 81 9/0998Dr.H.J.woiff709 81 9/0998 Dr.H.J.woiff RechtsanwaltLawyer
DE2365999A 1972-11-08 1973-11-03 CYCLOPENTANES FOR THE PRODUCTION OF 15 SUBSTITUTE OMEGA-PENTANOR PROSTAGLANDINES Withdrawn DE2365999A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2361381A1 (en) * 1972-07-13 1978-03-10 Pfizer (15)-(Hetero) aryl prostaglandin analogues - with long-lasting prostaglandin-like activity
US3929862A (en) * 1974-01-08 1975-12-30 Upjohn Co Substituted tolylesters of PGF{HD 2{B {60
US3998869A (en) * 1974-11-14 1976-12-21 The Upjohn Company Substituted anilide esters of 16-substituted PGE2
DE2737807A1 (en) * 1976-08-27 1978-03-09 Pfizer C LOW 1 -P-BIPHENYLESTER OF OMEGA-PENTANORPROSTAGLANDINES
US6531504B2 (en) * 2001-05-17 2003-03-11 Allergan, Inc. Prostanoic acid derivatives as agents for lowering intraocular pressure

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AT347607B (en) 1979-01-10
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FR2205339A1 (en) 1974-05-31
ZA738593B (en) 1974-10-30
CH601222A5 (en) 1978-06-30
JPS5644068B2 (en) 1981-10-16
NO146280C (en) 1982-09-01
NO145437B (en) 1981-12-14
IN139905B (en) 1976-08-14
FI58116B (en) 1980-08-29
YU264480A (en) 1983-04-27
PH15504A (en) 1983-02-03
AU6222573A (en) 1975-05-08
HU171818B (en) 1978-03-28
FR2275452B1 (en) 1977-12-16
FI58116C (en) 1980-12-10
NL7315240A (en) 1974-05-10
AR202311A1 (en) 1975-05-30
BE807047A (en) 1974-05-08
AR204816A1 (en) 1976-03-05
NO743588L (en) 1974-05-09
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NO146280B (en) 1982-05-24
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ATA937173A (en) 1978-05-15
IE39686L (en) 1974-05-08
YU287973A (en) 1982-02-25
FR2205339B1 (en) 1980-01-04
FR2275452A1 (en) 1976-01-16
ES434687A1 (en) 1976-12-16
PH13794A (en) 1980-10-01
SU538659A3 (en) 1976-12-05
CS188175B2 (en) 1979-02-28
IL43553A0 (en) 1974-03-14
SE420198B (en) 1981-09-21
DD111370A5 (en) 1975-02-12
SU1021340A3 (en) 1983-05-30
HU171945B (en) 1978-04-28
DD113211A5 (en) 1975-05-20
DE2355042A1 (en) 1974-05-22
IL43553A (en) 1979-10-31
NO145437C (en) 1982-03-24

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