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.
具有以下含义的化合物的配方以及其药学上可接受的盐和
酯,其中R1至R6在权利要求1中给出,可以用于制备药物组合物。