Patent ID: 7022725

Claim:
A pharmaceutical composition for the treatment of diabetic complications, which comprises a compound represented by the formula (I) wherein one of R 1 and R 2 is a hydrogen atom, halogen atom or an alkyl group and the other is an optionally substituted cyclic group; W is a bond or a divalent aliphatic hydrocarbon group selected from C 1-8 alkylene or C 2-6 alkenylene; Y is a group of the formula: —OR 3 , wherein R 3 is a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an optionally substituted alicyclic hydrocarbon group, an optionally substituted aromatic hydrocarbon group, an optionally substituted aromatic aliphatic hydrocarbon group or an optionally substituted acyl group, or Y is an optionally esterified or amidated carboxyl group, wherein R 1 , R 2 , R 3 and Y independently do not comprise heterocylce or heteroaryl, or a salt thereof or a prodrug thereof.