A compound represented by the general formula (I) or a pharmaceutically acceptable salt thereof: ** Formula ** wherein: A1 is a group selected from the group consisting of the following a) to c): a) C6-C10 aryl, wherein the anyl is not substituted or is substituted with 1 to 2 substituents independently selected from the group consisting of the following: a halogen atom, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, C1- haloalkoxy C6, (C1-C6) alkoxycarbonyl, cyano, C1-C6 hydroxyalkyl, carbamoyl, nitro, amino, (C1-C6) alkoxylamino-C1-C6 alkyl, mono (di) (C1-C6) alkyl, amino ( C1-C6) carbonylamino, (C1-C6) alkyl sulfonylamino and (C1-C6) sulfonyl, b) 5-membered heterocycle, wherein the anyl is not substituted or is substituted with 1 to 2 substituents independently selected from the group consisting in the following: a halogen, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, cyano and C1-C6 haloalkoxy atom, and c) 6-membered heterocycle, wherein the anyl is unsubstituted or substituted with 1 to 2 substituents independently selected from the group consisting of the following: a halogen atom, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, cyano and C1-C6 haloalkoxy； A2 is a group selected from the group consisting of the following d) af): d) C6-C10 aryl, wherein the anyl is not substituted or is substituted with 1 to 2 substituents independently selected from the group consisting of the following: a halogen atom, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 hydroxyalkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy, cyano, amino, nitro, carboxy, (C1-C6) carbonylamino, (C1-alkyl) -C6) carbonyloxy, (C1-C6) alkylcarbonyl and (C7-C10) oxycarbonyl, e) heterocycle, wherein the anyl is not substituted or is substituted with 1 to 2 substituents independently selected from the group consisting of the following: a halogen atom, hydroxy, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy, cyano, mono (di) alkyl (C1-C6) amino, (C1-C6) alkyl sulfanyl, amino , aralkyl
