| abstract |
Disclosed is a compound represented by the formula (1) below which has a high DPP-IV inhibitory activity and is improved in safety, toxicity and the like. Also disclosed is a prodrug of such a compound and pharmaceutically acceptable salts of them. n n n(In the formula, R 1 represents a hydrogen atom, an optionally substituted alkyl group or the like; R 2 and R 3 independently represent a hydrogen atom, an optionally substituted alkyl group or the like; R 4 and R 5 independently represent a hydrogen atom, an optionally substituted alkyl group or the like: R 6 represents a hydrogen atom, an optionally substituted aryl group or the like; and —Y—NH 2 , represents a group represented by the following formula (A): n n n(wherein m is 0, 1 or 2; and R 7 may not exist or one or two R 7 may exist and independently represent an optionally substituted alkyl group or the like) or the like.] |