COMPOUNDS

摘要

Compounds represented by general formula (I), optically active isomers thereof, or salts of either, wherein the bond indicated by the dotted line in the five-membered ring means that the five-membered ring is either an unsaturated cyclopentene ring or a saturated cyclopentane ring, provided when it is a cyclopentene ring, then X is OH, Y is =O, and Z is H, while when it is a cyclopentane ring, then X is =O, Y is OH, and Z is OH; and R is the residue formed from a compound having an SH group by removing the SH group.