| 摘要 |
An acetylcholinesterase inhibitor is provided of the general formula (I): <IMAGE> (I) wherein R1 is H, (C1-C8)alkyl or halo; R2 is H or (C1-C8)alkyl; R3 and R4 are individually H, (C1-C8)alkyl, NO2, hydroxy or halo; R5 and R6 are individually H, (C1-C8)akyl, aryl or aralkyl; R7 is H, halo or (C1-C8)alkyl, R8 is halo or (C1-C8)alkyl; R9 is absent or is H; and the bonds represented by-are individually absent or, together with the adjacent bond, form the unit C=C, with the proviso that if both of the bonds represented by-are present, R3 and R4 cannot both be H unless R7 or R8 is halo; and the pharmaceutically acceptable salts thereof.
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