| abstract |
Disclosed is a compound having excellent DPP-IV inhibitory activity and useful as a therapeutic agent for diabetes. [Solution] [Wherein, R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom, an optionally substituted alkyl group, or the like. R 5 does not exist, or 1 or 2 exists, and each independently represents a halogen atom or the like. Z represents the formula: OR 7 or the like. R 7 represents a hydrogen atom, an optionally substituted alkyl group or the like. W represents an alkyl group which may be substituted. Or a prodrug thereof, or a pharmaceutically acceptable salt thereof. [Selection figure] None |