wherein the ring A is a benzene ring having a substituent R1, fused to an adjacent 6-membered heterocyclic ring and further optionally having a substituent(s) other than R1, R1 is an alkylsulfonylamino group etc., R2 and R3 are (a) the same of different and a hydrogen atom, an alkyl group or a substituted or unsubstituted aryl group, (b) combined each other to form an oxo group or (c) combined each other at its terminal together with the adjacent carbon atom to form a cycloalkyl group, X is a group of =N-, =C(R4)- or -CH(R4), R4 is (a) a hydrogen atom, (b) a cyano group, (c) a halogen atom, (d) an alkyl group, (e) an alkenyl group, (f) a cycloalkyl group (g) an alkanoyl group, (h) a carbamoyl group or (i) a cycloalkenyl group, Ar is an optionally substituted aromatic cyclic group and a dotted line means presence or absence of a double bond, or a pharmaceutically acceptable salt thereof, which is useful as an antihypertensive agent etc.
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