| 摘要 |
A compound of formula (I): wherein R1 and R2 are, independently, hydrogen or alkyl or together, with the nitrogen atom, form a heterocyclyl; R3 and R4 ar e, independently, hydrogen, hydroxyl, alkyl, alkoxy, alkanoyloxy, cyano, nitro, alkylmercapto, amino, alkylamino, dialkylamino, alkanamido, halogen or trifluoromethyl; R5 is hydrogen or alkyl; and n is 0, 1, 2, 3 or 4; or a pharmaceutically acceptable salt thereof or a prodrug form that is hydrolysable to a compound as defined above.
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