Patent ID: 7482358

Claim:
A compound represented by the general formula (I): wherein Ar 1 represents pyridyl which may be substituted, the substituent being selected from the group consisting of halogen atom, lower alkyl, halo(lower)alkyl, hydroxy(lower)alkyl, lower alkoxy, halo(lower)alkoxy and lower alkanoyl; Ar 2 represents pyridyl which may be substituted, the substituent being selected from the group consisting of cyano, halogen atom, nitro, lower alkyl, halo(lower)alkyl, hydroxy, lower alkoxy, halo(lower)alkoxy, formyl, lower alkanoyl, lower alkoxycarbonyl and lower alkysulfonyl; Ar 3 represents phenyl, naphthyl, thienyl, pyridyl, quinolyl or 1,5-naphthyridinyl which may be substituted, the substituent being selected from the group consisting of halogen atom, lower alkyl, hydroxy(lower)alkyl, lower alkenyl, di-lower alkylamino, lower alkoxy, halo(lower)alkoxy, lower alkanoyl and aryl; 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; a salt or ester thereof.