wherein:
R1 is a moiety selected from:
R2 is CH2CH2CONH2 or CH2CH2OH;
R3 and R4 are independent substituents selected from the group including H, —N(CH3)2, or —OCH3;
or pharmaceutically acceptable salts thereof.
其中:R1是从以下摹块中选择的一个:R2是CH2CH2CONH2或CH2CH2OH; R3和R4是独立的取代基,选择自包括H,—N(
CH3)2或—O 的群体;或其药学上可接受的盐。