The present invention relates to a compound of the general formula (1): wherein, Y is a methylene group, and the like； A is an optionally substituted heterocyclic group, and the like； B is an optionally substituted phenyl group, and the like； R1 is an optionally substituted alkyl group, and the like； and R2 is an optionally substituted amino group, and the like； or a pharmaceutically acceptable derivative thereof, which has an inhibitory activity against cholesteryl ester transfer protein (CETP), thereby being useful for prophylaxis and/or treatment of arteriosclerotic diseases, hyperlipemia or dyslipidemia, and the like.
