A compound of formula (I) or a pharmaceutically acceptable derivative thereof,
wherein, R1 R2 R3, R4, R5, R6, X and Y are as defined in the specification; a process for preparing such compounds; a pharmaceutical composition comprising such compounds; and the use of such compounds in medicine.
式 (I) 的化合物或其药学上可接受的衍
生物、
其中,R1 R2 R3、R4、R5、R6、X 和 Y 如说明书中所定义;制备此类化合物的工艺;包含此类化合物的药物组合物;以及此类化合物在医学中的用途。