Patent ID: 7064142

Claim:
A compound represented by the general formula (I): wherein Ar 1 , Ar 2 and Ar 3 represent independently aryl which may be substituted, the substituent being selected from the group consisting of cyano, halogen atom, nitro, lower alkyl, halo(lower)alkyl, hydroxy(lower)alkyl, cyclo(lower)alkyl(lower)alkyl, lower alkenyl, lower alkylamino, di-lower alkylamino, lower alkanoylamino, lower alkylsulfonylamino, arylsulfonylamino, hydroxy, lower alkoxy, halo(lower)alkoxy, aryloxy, heteroaryloxy, lower alkylthio, carboxyl, formyl, lower alkanoyl, lower alkoxycarbonyl, carbamoyl, lower alkylcarbamoyl, di-lower alkylcarbamoyl, lower alkylsulfonyl, arylsulfonyl, aryl and heteroaryl; R 1 represents a group represented by the formula of —Ar 3 ; R 2 and R 3 represent independently hydrogen atom, cyclo(lower)alkyl, lower alkenyl or lower alkyl which may be substituted, the substituent being selected from the group consisting of halogen atom, lower alkylamino, di-lower alkylamino, lower alkanoylamino, hydroxy, lower alkoxy, formyl, lower alkoxycarbonyl, lower alkylcarbamoyl and di-lower alkylcarbamoyl; provided that when both R 2 and R 3 represent hydrogen atom, Ar 1 , Ar 2 and R 1 do not represent simultaneously an unsubstituted phenyl group; or a salt or pharmaceutically acceptable ester of a carboxyl group thereof.