The present invention relates to novel isomers of 6,9.alpha.-nitrilo-PGI.sub.1 s having a specific steric configuration, which are replaced by an alkyl (C.sub.1 to C.sub.8)-substituted cycloalkyl (C.sub.4 to C.sub.7) group in (1S,S) form, in (1S,R) form or in cis form at the 15-, 16- or 17-position of the PG skeleton, and, alkyl esters thereof, non-toxic salts thereof, non-toxic acid addition salts thereof and cyclodextrin clathrates thereof, possessing more potent PG-like pharmacological activity than other isomers.
本发明涉及6,9.alpha.-nitrilo-
PGI.sub.1的新异构体,具有特定的立体构型,该异构体在
PG骨架的15-, 16-或17-位点以(1S,S)形式、(1S,R)形式或顺式形式被烷基(C.sub.1至C.sub.8)取代的环烷基(C.sub.4至C.sub.7)所替代,以及其烷基酯、无毒盐、无毒酸加盐和
环糊精包合物,比其他异构体具有更强的
PG样药理活性。