| 主权项 |
1. A compound selected from compounds of a formulawherein each of R1-R4 is independently selected from H, alkyl, cycloalkyl, alkylsulfonyl, alkylcarbonyl, aryl, arylalkyl, alkenylalkyl and alkynylalkyl moieties, and moieties where R3 and R1 together and R1 and R4 together form alkylene moieties; each of R′1-R′4 is independently selected from H, alkyl, amino, alkylamino, alkylsulfonyl, alkylcarbonyl, alkoxy, alkoxycarbonyl, cyano, and halo moieties and moieties where R′1 and R′2 together and R′3 and R′4 together form alkylene or alkenylene moieties; and each of m and n is an integer independently selected from 0-3, and salts, tautomers and combinations thereof. |
