Patent ID: 7268128

Claim:
A compound of the formula (IA) or (IB), or a salt thereof: where A represents N or CR 4 , B represents a hydrogen atom or a halogen atom, R 1 represents optionally substituted C 3˜7 cycloalkyl or tert-butyl, R 2 represents hydrogen, methyl or ethyl, R 3 represents a hydrogen, nitro, cyano or halogen atom, NR 5 R 6 , C(═X)R 7 , SO 2 NR 5 R 6 , OR 8 , NR 8 CONR 5 R 6 , NR 8 SO 2 R 9 , a heteroaryl group, or optionally substituted C 1˜3 alkyl, R 4 represents hydrogen, or C 1˜3 alkoxy substituted, if desired, by one or more fluorine atoms, R 5 and R 6 are the same or different, and represent a hydrogen atom, optionally substituted C 1˜6 alkyl, or optionally substituted acyl or, together with the nitrogen atom which they are bound to, form azetidinyl, pyrrolidinyl, piperidinyl, morpholino, thiomorpholino, piperazinyl or homopiperazinyl, each of these groups being optionally substituted by optionally substituted C 1˜4 alkyl, OH, C 1˜3 alkoxy, CO 2 H, or NR 10 R 11 , wherein R 10 and R 11 are the same or different, and represent a hydrogen atom, optionally substituted C 1˜6 alkyl, or optionally substituted acyl or, together with the nitrogen atom which they are bound to, form azetidinyl, pyrrolidinyl, piperidinyl, morpholino, thiomorpholino, piperazinyl or homopiperazinyl, each of these groups being optionally substituted by optionally substituted C 1˜4 alkyl, OH, C 1˜3 alkoxy, CO 2 H, R 7 represents optionally substituted C 1˜6 alkyl, OH, OR 8 , or NR 5 R 6 , R 8 represents hydrogen or an optionally substituted C 1˜6 alkyl group, R 9 represents an optionally substituted C 1˜6 alkyl group, and X represents O, S or NH.