A compound having a hypoglycemic effect is provided. The compound and a pharmaceutically acceptable salt thereof are useful for the treatment or prevention of diabetes, obesity, and the like. The compound is represented by the general formula (1): (wherein R 1 and R 2 are each independently a hydrogen atom, a halogen atom, an amino group, a hydroxyl group, a hydroxyamino group, a nitro group, a cyano group, a sulfamoyl group, a C 1 to C 6 alkyl group, a C 1 to C 6 alkoxy group, a C 1 to C 6 alkylsulfonyl group, a C 1 to C 6 alkylsulfinyl group, a C 1 to C 6 alkylsulfonyl group, or a C 1 to C 6 alkoxy-C 1 to C 6 alkylsulfonyl group, and A is a substituted or unsubstituted heteroaryl group).
