The present invention involves a compound represented by general formula (I), a derivative thereof and a use thereof:
wherein R1, R2, R3, R4, R5a, R5b, R5c and X are defined as in the description.
本发明涉及通式 (I) 所代表的化合物、其衍
生物及其用途:
其中 R1、R2、R3、R4、R5a、R5b、R5c 和 X 的定义如说明书所述。