| 摘要 |
A compound represented by the formula (I): wherein R1 is an oxo group, -N-R or the like; a group represented by the formula: is a group represented by the formula: R2 is a group represented by the formula: R3 and R4 are each H, or C1-C6 alkyl, C3-C6 cycloalkyl, C1-C6 alkoxy, C1-C6 alkylamino, di(C1-C6)alkylamino or C1-C6 alkylthio, each of which is optionally substituted; and R5 is H, or C1-C6 alkyl, C2-C6 alkenyl, cyclic group, each of which is optionally substituted, -CO-R8 or -O-R8', or a salt thereof. The compound of the present invention is useful as a drug for the prophylaxis or treatment of cardiovascular diseases, metabolic diseases and/or central nervous system diseases.
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