Patent ID: 8258131

Claim:
A fused bicyclic compound of the following formula [I]: wherein the ring A is optionally substituted with one or two substituent(s) selected from a halogen atom and a C 1-8 alkyl group, R 1 is an alkylsulfonylamino group or an alkylaminosulfonyl group, R 2 and R 3 are (a) the same or different and each is a hydrogen atom, an alkyl group or a substituted or unsubstituted aryl group, (b) combined with each other to form an oxo group or (c) combined with each other at its terminal together with the adjacent carbon atom to form a cycloalkyl group, X is ═N—, and Ar is a 6- to 10-membered monocyclic or bicyclic aryl group optionally containing one or more heteroatom(s) selected from a sulfur atom, an oxygen atom, and a nitrogen atom, said aryl group being optionally substituted with one or two substituent(s) independently selected from a halogen atom, a cyano group, a C 1-8 alkyl group, a trihalogeno-C 1-8 alkyl group, and a C 1-8 alkoxy group, or a pharmaceutically acceptable salt thereof.