Compounds of formula
as well as pharmaceutically acceptable salts and esters thereof, wherein R1 to R6 have the significance given in claim 1 can be used in the form of pharmaceutical compositions.
式的化合物
及其药学上可接受的盐类和
酯类,其中 R1 至 R6 具有权利要求 1 中给出的含义,可以药物组合物的形式使用。