| abstract |
A compound, represented by the following chemical formula 1, or a pharmaceutically acceptable salt thereof: ** Formula ** in which, Ar is phenyl which is substituted with one to five halogens; A is ** Formula ** or ** Formula ** B is phenyl, pyridinyl or pyrimidinyl, which is unsubstituted or substituted by one or two R3 groups; R1 is hydrogen or C1-4alkyl; R2 is O, NH or NCH3; and R3 is independently halogen, C1-4 alkyl, C1-4 haloalkyl or cyano. |