A compound having a hypoglycemic effect is provided. Thecompound and a pharmaceutically acceptable salt thereof are usefulfor the treatment or prevention of diabetes, obesity, and thelike. The compound is represented by the general formula (1):(see formula 1)(wherein R1 and R2 are each independently a hydrogen atom, a halogenatom, an amino group, a hydroxyl group, a hydroxyamino group,a nitro group, a cyano group, a sulfamoyl group, a C1 to C6 alkylgroup, a C1 to C6 alkoxy group, a C2 to C6 alkylsulfanyl group,a C2 to C6 alkylsulfinyl group, a C1 to C6 alkylsulfonyl group,or a C1 to C6 alkoxy-C1 to C6 alkylsulfonyl group, and A is asubstituted or unsubstituted heteroaryl group).
