Disclosed is a compound which is useful as a prophylactic or therapeutic agent for cardiovascular diseases, nervous system diseases, metabolic diseases, genital diseases and gastrointestinal diseases. Specifically disclosed is a compound represented by Formula (I) or a pharmaceutically acceptable salt thereof. (I) wherein Z represents a group represented by Formula (II-1), (II-2) or (II-3) shown below; n1, n2 and n3 independently represent a numeral value of 0, 1 or 2; R