| 主权项 |
1. A compound of Formula I, or a pharmaceutically acceptable salt thereof, wherein: two of R1, R2, R3, and R4 each is a halide; the remaining two of R1, R2, R3, and R4 each is independently ammonia or an amine; and R5 and R6 each independently is hydrogen, R7, or wherein:X is absent, C(R8)2, O, S, or NR8, andR7 and R8 independently at each occurrence is selected from hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl, wherein each of the alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, and heteroaryl groups optionally is substituted with one or more groups, each independently selected from halogen, cyano, nitro, hydroxyl, ester, ether, alkoxy, aryloxy, amino, amide, carbamate, alkyl, alkenyl, alkynyl, aryl, arylalkyl, cycloalkyl, heteroaryl, heterocyclyl, phosphono, phosphate, sulfide, sulfinyl, sulfino, sulfonyl, sulfo, and sulfonamide, wherein each of the ester, ether, alkoxy, aryloxy, amino, amide, carbamate, alkyl, alkenyl, alkynyl, aryl, arylalkyl, cycloalkyl, heteroaryl, heterocyclyl, phosphono, phosphate, sulfide, sulfinyl, sulfino, sulfonyl, sulfo, and sulfonamide is optionally substituted with one or more suitable substituents. |
