PT91191B - Processo para a lactonizacao de acidos mevinicos e seus analogos - Google Patents
Processo para a lactonizacao de acidos mevinicos e seus analogos Download PDFInfo
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- PT91191B PT91191B PT91191A PT9119189A PT91191B PT 91191 B PT91191 B PT 91191B PT 91191 A PT91191 A PT 91191A PT 9119189 A PT9119189 A PT 9119189A PT 91191 B PT91191 B PT 91191B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/16—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
- C07D309/28—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings 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
- C07D309/30—Oxygen atoms, e.g. delta-lactones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/06—Antihyperlipidemics
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- Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Pharmacology & Pharmacy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Hematology (AREA)
- Veterinary Medicine (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Steroid Compounds (AREA)
- Pyrane Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Saccharide Compounds (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
. ι i - : 1-:-, 1 'τ
ς:-· + t-::· "::: .. ^ .j , .£ 1 - .· :;η η: .Π t. é ti O-i ·!" Λ~ Γ ··' Ζ’ 'J. 1 Γ; Cc' 5
HOY^co2á *»
R d A é h i d~ g ::u bu 11 tu:, d o fenilo, diííí í_! -? ' 1 gru ir*
bad original \
s.né.locz-s & sono o n 1 oa ou 1001-si η uá t .1. cos condui a uma nisiuio daa-fo-;:uv lactona e ácido d 1 f. i d 1 c u i „ nõv-o.cor!' o conircidliiido nu ..ίο má c.od 1 Ocierói do alio ren diuento ouro o. 11 c cor: i c uç do do livre ou 00.I amónio foi ofectuada colo ucuoc inon ío cosòoo cuba-
1 U : - 1' 1 O. : Π .· · O O: l - 0 1 dO 10' 0 ,0 10,..: , · O_i. _ c\ ~ _ :: - - - “V õiilij, ou acetato ísluo-ddiIicg a, ou. ::ué o i mo do rafluuo, A lac f'oo ia;á j õ o o ta 1 i c a:du cola prosoroí do· ilidi. A acidioidado
bad original
·> - .- - ol! ·· · .· ao :a.::3.:; a. a a a. d;,; da ua aaid- f i lavada do prado do:· I a a : ::r· a alaora 'a invar ter o acoA I iiaaa a-ara a voa.sa a.:- ; --1:--- ri i h 1 H •iov sal e=o | ,q - 3 a; : _ _1 1 -]- . __ : — · . de • ·· . _ · a,aa a a _ loc 3 ,z ee - e e . e-~e 3 a . a. - a.v-aioa aa o:a-r a da:, lid pela '-eao :: da: a: a o d· —prado a a o da a : ; a a : -Hv, , 0.0-0 La .· □ d ãLLL.· Γ- r ea,g en t a ãã.·- ãalã d- des 11 1 .? e S’ c· a· :e: orai;;:a a. d d. ea oabogaa ao O. d Oi t G ·, A ;- aa.ddaa da do-a, a Γ· :· V V A! da aal a raio ia— a cauiinie inve i- r e C DG3 i c da do equilíbrio paea o l.adc lãctcna . Π- ·" i ’ cr: -ãdCd e c a Lrdariaraa ,a Ξ C' ' r.Ã ffi - -½ dlã; CC ·' C "= * ã 3 ene, T i p iere ata o dada draaba de aa:.da : v. :d Όνο a·:: ee-< cecc- c c a d a 1 i. o a o a r ácid d r aaa,; a '-- p lí a n t ο ο o: j. o a d.' a. r ta f:L ··· >Λ Lee:, cp.jd de ,·- o a a ;?q d - a j.ij i ξ e e d e .a..;. ::aaa booaaa: de . · · e para i t i ndo a foríiícd· aaaoãõ.ida da aub—a ada- actana e x. __ ·_ ;.J z> * Sob a a d do d i. ç das da rsa.Cidlu, α produto 3 -hidra-a i 1 e - íad ado durão te oericdc'5 do tesnpc· pre 1 r-ngade-s ao á o id o qae r d o d u d a d u a a t i d a ci e s crasLanteã da dioarc i. ' o qu.a ds l: :v, raacc?: de ea t er i f i a ac ao entra o graoe 3-hidro/i 1c da 3-da. d raa i. acdona e o á ai do Iivre„ r—- -— -------
$AD ORlGfNAL
Uma segunda impureza, t-enul tente d a desidra taç^o do grupo 3-hidrc;; i. I α no anel lactanj , fce também ciu-sr· ado Líand:; condicSes de I actoni zaçao ar. ter i ores» Eso? impureza foi do τι esmo modosa inef i.c ien ieoen te removida poso reooòsta! loaoSo, originardí: menores rendi men tos. 0 preser, te invento alivia esto problema..
BAD ORIGINAL
o» -a ca. ar ti τ ca caio :\a rca ;< n a: η d a ο o ç3c completa da 1 aciona r lacto ri a. a conduz aos lo è. czncletíÇno da rir-n:z:-ac, a lactona a cor tinuansir do· rsm loco que se forma, minimizando a &;;dcci riu. da raa.op ΐο a min imoz ar zio aooim reaccao coaierior dscs formar dmmeroo., 1 : -· - Z O p ?- ' .· . lado d nizaçao, No prezar; i ;;io naco os reaceu a 1 a c. teria ·· c C Ο Γ: d .1. -~ z c a 1 para a ou obLeíncis um C ;·: ΊΗ r jroci e Ti 3. S 1 Tí " L: Γ ' v; de lactonizai *ee ccíTt- .
BAD ORíGINAL \
As ''antaçens principais realizadas no o o iovonto con.oarodai com a arte anterior saio prosLitivids.de do orocesoo e pi.rsaã do produto ai .nsr :aiaaOs processos ar. ter'i o-,es da. arde sã.::: conduzidos num meie a 1 lamente diluído (0,1 M > a rim de n:in imi zar a TCrTaião do diíiisro. 0 presente irvsnto ps-mita a 1 acton.icação a conceri traçSes muito maiores C" õ,24r1> iselhorando assim • " *
BAD ORfG/WAL
!' aon t U ΐ. ÉiT; ífi-?r i^r- prsccsa ano a " ; c:: sdicicn ; i os ; . ·.·. :: :h:;!v5:v:í o concentrado antes de isolar a iactona; no aressrris prccai:·; a novo o cresen c& processo dssonstra urna ssaor sfl.cisrO ia a:? çuo a a-'da andarcor,
Er --“o laçado à pu.r32í do produto, o no toco da ar" te a” te!·'· j.oi" crq inoc ua 300:. — produto c qual co-n a a cia. r , >* a. a ,1. oregíduã no o Γ', n t a; o r
O II
CR urn.:;> iopurscs dioén d i f i c i 1 do rorevor, enquanto que L, ic L V 0' i 5 desta irpuracã SCO as co ndiçofic do láctr-oaíc u a :Od,r sã'- roeu o idos ir ί"?ΠΟ“· GC Qi.l·? d* , "'u * ft é alquilo:
R( d l-ò, CR-, Oh , CH^DCf^QlK^, iCCUR,, C(-0uR,K 0 H ou MH , At u u:n cati.Sc ostàli
BAD ORIGINAL
Κ — S Γ· a.'U L, _ .... ; a ;
•ί -- R. Ο F\_ S:ÍC 1 Π C ίΐ DOS'· C ΡΟ Ο Ο ;τ'; ÍL· Γ'[ 00/ 0 Η -U : . . elcui Is.
.oss;. en âquá, □ sol -senta particular á- e t er.-;u.- a :!u peias csracis--'.arisco:.: ce uúslíI :rccêcc . : . a c fêcsrcí cs o c 1 u b .i. I idade entre o scicio r sss ’ hsdrcai c a leciona.-, a c ' i s t a 1 i :: aça· s selêctccc. a soinéij.caa da. ccistslizsceo, m? íusc^c sql: j-eclvente orgânico. acetona e cetenol de preferencis ácido s ·; ? ....;, a.c o ton i t r i 1 o ou. s : i l) j Ácccp-r; :co ou. orq sn Lco cio sc i d 1 c d s d a suf iciente : ·· · · · c a : 3.1 i. z a a f.ornaçáio de una 1 ac tens. * ã;sr:plos ca êcidcs apropri.;·--.ias que poder ser sepcscsdcc ato ácido fero.ico, fccdcaicc , t r i f 1 u oro a c ético, su 1 f á r:. ca, c 1 o r i d r i c o , per c i. 6 r i c a , p -1 o 1 u s' “ ca - aLcitesuiaca e aecancsul fónica. A lactanizaçuc coda ser efaotuada ac longo de caca
ssoparâtaras d e 2 ã ° Γ a 30°C , do ort^erEncia, ·—. __·—. ror stico que a tas peradLUsa π3o suba a c .. τ r. :j>~ 30 °C Ί3 ve to crigirier is a for !T! a ·;; 0 O 0 cêêcSãse dõ Ã: L· b~D:"OdU. tO T □ o c ati.de e metálicos preferidos são catides de c"; etãiS c:a 1 inos· , ta 1 como sódio ou potássio, catives de metais a1 c a 1 i η o rrosos, tal CO;T;Q cálcio ou magnésio, ou catides de o u t r o s ga-ru.
bad original
-roais cal como: slu i r= :i, , i i ' : -rc,,sl c.j ocdelcc, Ge os iodes ae τs 00 1 ·· 1 oíl: η0 c 0- ti Rss .- rosal alcalino terroso, 0 ceco.Giês de clocvriO o:.ár p -e -Ge ri,:;-,·::.. 000: orsoaics de sódio, cálcio e e 1:.:::,:. rio se '.O Ode sT: - ; c pref cr. : - i r-\ cc
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3 de iór'medis (I - 1 - 1 d R. é CH... : J. U '
U ; :..i .4. '4 ou i , 1 111r ocj.11 o e RR 0 lH_ . s e mH s e 1· .· ·' au.ni .L ' ·*!·' solvente orpanico é doido acético, acedem: i. cri 1 o :oísÍi:ad::r ácido o ácido t d f 1 uor ::s : e d 1 fónico. Nu. m a subcle.ose R é 1 ,, 1 — d ime r í 1 cr
0.· o u á c i d o o e t a r. os··.. 1 — pilo, ·:: sol ver, te ocga-do á á ::0:0o trodooiro-
c processe do oresente o lo.το.dando: o invento
Go E:;sito1 os seoLcntea ilustram inverta s não devoo ser considerados 00 aureserdado nas Reivi.nd icacoes em enexo.
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A a 3. torna DcrcS:: da água· (32 mi) foi a::::::"ací cia rente o ;;ar:rdu de 1 hora. A 00000-0 foi a ssgoo::- agitada i.aorta .0:1 2 horas, ϋ ácido t r 1 f 3. ucoocét: 1. c o foi noa ora 1 iza. d o· 001 h.i .d oi 1 ifj do ο-πο corronfrajo ' 5 :i 3 oi , 1,3o 5 ))n,; 7v rrc 3 ; o quãi foi adio sonado 1 en .taõõn -L. „ 00 arrefecoãsnt _ .!_ . - -· -'! -1 G c: o r; j a n t 0 f 0 i a seca .1 Γ " π ítj.gd c a r a p te 1 HG r 0 e r. S ca: a i. r 0 Z da. to f 0 3. d :-ajj a 1 ·? V a - 'ZZrJi |pp r, 1 . = õ-o 7; 1 s t a _£ ο 0 d 0 E-.zé t. icc-á g a a ( 1:2 v / ) sedaida por lava geo CC :T: 100 0 I da . A P ,r\ ρ ,-Ã 7 1 0 t f i ξ o ::eso conetant ILO i p· v soro .d. — — - UÍ7! imento s L‘ r< v e d 0 •r> Z C) 10 para cfrerccs 0 c on.G =:::· etc Za7 ti t a 3. ρ: C Ci IT! ..ira páreos do hSfy‘í (HPLio, o novel de dinera foi ""“•'WWf bad original \
d Ι .· ,3,6- la tj- h Ldra- Α - E 1 , 3,3 , 7,3 -, 2a ". :-- ; -Hí 3,i d r 3 (b , ò to) — d ~t. < b '> - 2 — d i oat:11 to t i ' i I a - 1 ) — i ; 9 )—o a d d 11 ]-72 7 ; 22'7 " -1 _.-o. d i.:.- i.ro - iTr-no 1 : , o 327 - hi-d··':. : r,J :,'h :;l3 3í:i-;: 2" , 7~"2- -: da:. ao.: apon - .-.vis. nustsra to ipipp. a c á t i. -r o 24 7'· olf , ;-:uj (2-:; 1 ' a 22-23 °2' ,0:1, -3.3
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Aijbp 'çr: rH; -~ - -r-o 3.S , - ; ; i } * 1 : 3,d i C 1ΟΓ, P d 3 . -l ·- bo ido dO 110-.:.:1 1 Γ ΞΡ 1 . . i .. -3 0 23... , :,-o "-Pd 0 *í - ' 3 i. -? -J10 loiõ-i-:; : · - Õ- 11V -; ‘ 7 '7 "1111.1 r ". da 00:.1:..0-.1 ,J : *: , Q ccnjun ::o "oi a. aa 3i :' a 0 1 d no io -' o 0 t 0 d hc-fr. e ;> - f-- ... 1 —' r-· "1 1 tra-dõ a I - "-oda lio -- -Po - 1 p‘;o . 7 7 ΓΠ7 13.t ....... .· „ !-1 : :.·. ido apatia õ-ap,1 (1:2 v / v > aadi i : 1 :õ- la vagem com 10ã o 1 -3 - Ãqu.a - A papo f 7 · J õ. ;*· 0 7. ·.?. a p-aao ::00 a tan da in '.'aooQ ·?. 33 °2 0 0 b u íT: v.?.rr.i.!T:9fi tO :z'J.S ,·' a da a 07 ; " -3. c bierooo ti t_ i G C G:Tí _·.(!: 3. ptp ;-e 7; a da ? — » / ; Hcd_c ; , 3 n,vei -d 0 dioaio foi
Bad origiNal
Ρrξ ρ:? r agâo de -:-:)-:2-:3(3)-:2,2-;?;€· t i 1 tat i r i 1 c:< i ) -2 ) 3 ) , i 1 R ) -2 imeti I -1,2,6,7,2 a 1 R ) — he >;ahid ron a f ti 1 — 1 í S ) j a ti 1 ’ - 4 < R ) ~r i d ro;: i--3,4,5,ò-tet^ah.id γο-2Η- p i ran-2-on a U ooopost
yUlH J J _! p t O
d D rn titula έ prspi" ma s sufa stituinde 7 — C1,2 't _o 3 ) - \ 2,2-di;net i 1 :IÍ '· ‘ "j r" X an C -5. t. O da amònio c CíTíO 8. - a;n õ Γ; t 8 acetona ou a o a t o ni cl vente orgânico, mas c ai 1. 2. w. -i L.r n a ρ r e s s r: ~ a de u:.i , / , h , H;i i R> -Meus -;: i 5 — 1 13)—na- til) — ubstsncis. a ser trilo podem e e r om um sol-. -en te a sssda da pH a
Exemplo 1 cu Enemplc 2 h i d r a-2 1S5 ,3 Fu -di met i. 1 3 í R ) , ã ( R )-d i hid rc a i hcct lac ionizada - AI terce, i iv substituídas ccmc c s neutra,, o ácida à nsutr pH 6, BAD ORIG'Mλι
Claims (2)
- ο ιιBAD ORIGINAL t r .¾ ·;; 0/" 0 r\ d ; d 0 ·' I • / 1 1 0 ? £ O tr-L< t 0? r?0H :. ·: iΓ: rod·.. t: j 1 r.ctona ; ι I ; ;(II) a.'.--: » --- · -- £ £ .£ £ .r. o - ;·- £ £ ~ 0 ' a ::'s o 0 0 0 * . - ~ — L. .. - por 1 ^ or- c:V o· : s sr rd- * : i . ; -T.?. . - Pr nassa de scaado :: c,i: a. ÍF ei vis dias £ 3. 0 J ; ι- λ·:: - ré irado pc-·· R sor' esc boi t i 1 c cl· - i i-dicsti1prop i 1 0e b — 5Pi duplas í :;.g a a des » 4b , -- Processo ds acordo C C s Reivindica t -**í 1 .Ι Car0C~ hír uuado por o ssl to PRà-Pí S 0: 1 OCO i. ? d Ο e n t =* 0 id0 0 C 0 ρic o , acet oni ά'ΐ’ο ou dcetoí. * rr; • Fr·"ar:osso ds acordo C ΟπΊ a Rei.vindaca çS o 4:. 0. 3. 0 0 0 Γ. 0 0 irado por o ca to.I isador «eido s 3 r ·_·. s 1 scc lonodo Ç?Π X. 0 0 * á.C ldu17 fórmico, fosfórico, trifluoroacético, sulfúrico, clorídrico, perclórico, p-toluenossulfónico e metanossulfónico.
- 64. - Processo de acordo com a Reivindicação 5, carac-terizado por R ser 1,1-dimetilpropilo. 7a. - Processo de acordo com a Reivindicação 6, carac-terizado por o solvente orgânico ser ácido acético e Z ser NH4+. 8a. - Processo de acordo com a Reivindicação 7, carac-terizado por o catalisador ácido ser ácido trifluoroacético, ou ácido metanossulfónico. 9a. - Processo de acordo com a Reivindicação 8, carácter izado por o catalisador ácido ser ácido metanossulfónico. 10a. - Processo de acordo com a Reivindicação 5, caracterizado por R ser sec-butilo. 11a. - Processo para a preparação de um composto de estrutura (II):em que (II) R é 01-10 alquilo r1 é ch3, ch2oh, ch2oc(=o)r2, co2r3, C(=0)NR4R5, OH, CH2OR2 ou CH2NR4R5; Z é H ou NH.+ ou um catião metálico; 4 R2 é C alquilo; R3 é H ou alquilo; R4 e R5 são independentemente seleccionados entre H ou alquilo; a e b são ambos ligações duplas ou um de a e b é uma ligação simples; caracterizado por compreender o tratamento de um composto de estrutura (I) 0em que R, R^, a e b são definidos em relação à estrutura (II) e em que Zé H, NH4+ ou um catião metálico num solvente orgânico miscível com a água, com um catalisador de ácido forte e por, em seguida, se adicionar gradualmente água até se efectuar a cristalização da lactona a partir do meio de reacção, mediante o que se produz o composto de estrutura (II) contendo menos de 0,2% de impureza dimérica. 12a. - Processo de acordo com a reivindicação 11, caracterizado por R ser C ^ alquilo, R^ ser CH3 e Z ser H ou ΝΗλ + . 4 13a. - Processo de acordo com a reivindicação 11, caracterizado por o solvente ser ácido acético, acetonitrilo ou acetona. 14a. - Processo de acordo com qualquer uma das reivindicações 11 a 13, caracterizado por Z ser NH4+. 15a. - Processo de acordo com qualquer uma das reivindicações 11 a 14, caracterizado por o catalisador de ácido forte ser ácido fórmico, fosfórico, trifluoroacético, sulfúrico, clorídrico, perclórico, p-toluenossulfónico ou metanossulfónico. 16a. - Processo de acordo com a reivindicação 11, caracterizado por se obter um composto em que R^ é CH^. 17a. - Processo de acordo com a reivindicação 11, caracterizado por se obter um composto em que R.^ é OH. 18a. - Processo de acordo com qualquer uma das reivindicações 11, 16 e 17, caracterizado por se obter um composto em que R é sec-butilo ou 1,1-dimetilpropilo e a e b serem ligações duplas. 19a. - Processo de acordo com a reivindicação 11, caracterizado por se obter a 6(R)-[2-[8(S)-2,2-dimetilbutinilo-xi)-2(S),6(R)-dimetil-1,2,6,7,8,8a(R)-hexa-hidronaftil-1(S)]- 20 etil]-4(R)-hidroxi-3,4,5,6-tetra-hidro-2H-piran-2-ona contendo menos de 0,2% de impureza dimérica. 21a. - Processo de acordo com a reivindicação 11, caracterizado por se obter a 6(R)-[2-[8(S)-(S-metilbutiriloxi)--2(S),6(R)-dimetil-1,2,6,7,8,8a(R)-hexa-hidronafti1-1(S)]etil]--4(R)-hidroxi-3,4,5,6-tetra-hidro-2H-piran-2-ona contendo menos de 0,2% de impureza dimérica. Lisboa, 17 de Julho de 1989J. PEREIRA DA CRUZ Agente Oficial da Propriedade Industrial RUA VtCTOR CORDON. 10 A 3.“ 1200 USBOA
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/221,475 US4916239A (en) | 1988-07-19 | 1988-07-19 | Process for the lactonization of mevinic acids and analogs thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PT91191A PT91191A (pt) | 1990-02-08 |
| PT91191B true PT91191B (pt) | 1995-03-01 |
Family
ID=22827965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PT91191A PT91191B (pt) | 1988-07-19 | 1989-07-17 | Processo para a lactonizacao de acidos mevinicos e seus analogos |
Country Status (26)
| Country | Link |
|---|---|
| US (1) | US4916239A (pt) |
| EP (1) | EP0351918B1 (pt) |
| JP (3) | JPH0273078A (pt) |
| KR (1) | KR970011286B1 (pt) |
| CN (1) | CN1022831C (pt) |
| AT (1) | ATE111459T1 (pt) |
| AU (1) | AU609319B2 (pt) |
| CA (1) | CA1287639C (pt) |
| CS (1) | CS274640B2 (pt) |
| CY (1) | CY1813A (pt) |
| DE (1) | DE68918191C5 (pt) |
| DK (1) | DK173115B1 (pt) |
| ES (1) | ES2058475T3 (pt) |
| FI (1) | FI92695C (pt) |
| HK (1) | HK136894A (pt) |
| HR (1) | HRP930685B2 (pt) |
| HU (2) | HU202511B (pt) |
| IE (1) | IE64304B1 (pt) |
| IL (1) | IL90925A (pt) |
| LV (1) | LV11033B (pt) |
| NO (1) | NO172800C (pt) |
| NZ (1) | NZ229879A (pt) |
| PT (1) | PT91191B (pt) |
| SI (1) | SI8911362A (pt) |
| YU (1) | YU47492B (pt) |
| ZA (1) | ZA895458B (pt) |
Families Citing this family (98)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916239A (en) * | 1988-07-19 | 1990-04-10 | Merck & Co., Inc. | Process for the lactonization of mevinic acids and analogs thereof |
| GB9007738D0 (en) * | 1990-04-05 | 1990-06-06 | British Bio Technology | Compounds |
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