| 摘要 |
A compound of the formula: <IMAGE> (I) wherein each of R1, R2, R3, R4, R5 and R6 which may be the same or different, is hydrogen or C1-C4 alkyl; one of X1 and X2 is nitro, fluroine, chlorine, difluoromethyoxy or trifluoromethyl and the other is hydrogen, or both of X1 and X2 are chlorine; and Y is <IMAGE> wherein A is C-C6 alkylene, each of Ar1 and Ar2 which may be the same or different, is phenyl which may be substituted by chlorine, fluorine or C1-C3 alkoxy, and m is an integer of from 0 to 4, or Y is <IMAGE> wherein A, Ar1 and Ar2 are as defined above when that both X1 and X2 are chlorine; or a pharmaceutically acceptable salt thereof.
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