This invention provides a compound represented by general formula (I) having a high level of inhibitory activity against a cholesterol ester transfer protein (CETP) wherein R, R, R, R, and R represent a hydrogen atom, a halo-lower alkyl group, a cyano group or the like； R represents an alkyl group, a cycloalkyl group or the like； R, R, R, and R represent a hydrogen atom, a halogen atom, a lower alkyl group, a halo-lower alkyl group or the like； R and R represent a hydrogen atom, a lower alkyl group, a lower cycloalkyl lower alkyl group or the like； and R represents a hydrogen atom, a halogen atom, a lower alkoxy group or the like.
