| abstract |
The present invention relates to a compound represented by the following formula (1) or an optically active substance thereof or salts thereof.n n n Formula 1n n n n n n n n In the above formula, the bond represented by the dotted line in the five-membered ring means that the 5-membered ring is a cyclopentene ring having a double bond, or it may be any of saturated cyclopentane rings, and in the case of the cyclopentene ring X is OH, Y is = O, Z is H, and in the case of the cyclopentane ring, X is = O, Y is OH, Z is OH, and R is a residue from which a SH group is removed from a compound containing an SH group. |