| 摘要 |
Provided are compounds of the structure: <IMAGE> wherein R1, R3, R5 and R6 are independently H, alkyl, aralkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkenyl, alkynyl, hydroxy, hydroxyalkyl, alkoxy, mercapto, mercaptoalkyl, alkylthio, amino, alkylamino, aminoalkyl, formyl, carboxy and salts thereof, carbalkoxy, alkanoyl, cyano, nitro, halo, trifluoromethyl, alkylsulfonyl, aminosulfonyl, carbamoyl or cycloalkyl; and R7 is H, alkyl, aryl, aralkyl, oxo, or alkanoyl; wherein at least one of R1+L, R5 or R6 is an aryl, heteroaryl, or heteroaryl substituted with H, alkyl, halo, amino, trifluoromethyl or cyano. |
