Patent ID: 6380262
Filing Date: 2002-04-30
Classification: A61K,C07K

Abstract:
A five-membered ring compound of formula [I]: wherein the bond in the five-membered ring represented by a broken line means that the five-membered ring may be either a cyclopentene ring having a double bond or a saturated cyclopentane ring; if the five-membered ring is a cyclopentene ring, X is OR1, Y is &boxH;O and Z is H; if the five-membered ring is a cyclopentane ring, X is &boxH;O, Y is OR2 and Z is OR3; R1 is R4 or â€”(CO)â€”R5; R2 is H, R6 or â€”(CO)â€”R7; and R3 is H, R8 or (CO)â€”R9 (wherein R4, R5, R6, R7, R8 and R9 may be identical or different each other, and are an aliphatic group, an aromatic group or an aromatic aliphatic group, and R5, R7 and R9 may be H), provided that R2 and R3 are not simultaneously H; and W is a residue in which an SH group is removed from an SH group-containing compound, or an optical isomer thereof, or a salt thereof.