Patent ID: 7189717

Claim:
A compound represented by the formula: wherein A represents a phenyl group, pyridyl group, thienyl group or furyl group which may be substituted with one or two groups selected from a halogen atom, a hydroxyl group, a C 1-6 alkyl group, a C 1-6 alkoxy group and a C 1-6 alkoxy-carbonyl group, R 1 represents a hydrogen atom, a morpholinyl group or a group represented by the formula —NR 1a R 1b , wherein R 1a and R 1b are the same as or different from each other and each represents a hydrogen atom, a C 1-6 alkyl group, a C 1-6 acyl group, a phenyl group or a C 1-6 alkylsulfonyl group, and R 2 represents a hydrogen atom or a group represented by the formula —NR 2a R 2b , wherein R 2a and R 2b are the same as or different from each other and each represents a hydrogen atom or a C 1-6 alkyl group; and B′ may be substituted with one or more groups selected from a halogen atom, hydroxyl group, a C 1-6 alkyl group and amino group or a salt thereof.