[PROBLEMS]To provide compounds useful as preventives or remedies for circulatory diseases, nervous diseases, metabolic diseases, reproductive system diseases, and digestive diseases.[MEANS FOR SOLVING PROBLEMS]Compounds represented by the general formula (I) or pharmaceutically acceptable salts thereof: wherein R1 is C1-6 alkyl, C3-8 cycloalkyl, or the like; R2 is phenyl, heteroaryl, or the like; Q is N or CH; and M1, M2, M3 and M4 are each independently hydrogen or C1-6 alkyl, or alternatively M1 together with M2 or M3 forms —CH2-CH2- or the like, or M4 together with M2 or M3 forms —CH2-CH2- or the like, with the proviso that M1, M2, M3, and M4 are such that one —CH2- or —CH2-CH2- group is formed thereamong.