Compounds of formula (I) or a pharmaceutically acceptable derivative thereof:
wherein A, R
1
, R
2
, R
x
, R
8
, R
9
and n are as defined in the specification, a process for the preparation of such compounds, pharmaceutical compositions comprising such compounds and the use of such compounds in medicine.
公式(I)的化合物或其药学上可接受的衍
生物:其中A,R1,R2,Rx,R8,R9和n如规范中所定义,制备这种化合物的过程,包括这种化合物的制药组合物以及在医学中使用这种化合物的用途。