Compounds of formula
as well as pharmaceutically acceptable salts and esters thereof, wherein R1 to R3 have the significance given in the application and which can be used in the form of pharmaceutical compositions.
这是一段关于化合物的描述,其
化学式为某些特定的R1至R3,可以用于制备药物组合物,同时其药学上可接受的盐和酯也可以使用。