Compounds of formula (I)
as well as pharmaceutically acceptable salts thereof can be used in the form of pharmaceutical compositions, wherein R
1
, R
2
, R
3
and n have the significance given in claim
1.
化合物的
化学式(I)以及其药用盐可以用于制备药物组合物,其中R1、R2、R3和n的含义如权利要求1所述。