The present invention relates to compounds of formula (I),,wherein R1to R3, A and Q are as described herein, and their pharmaceutically acceptable salt, enantiomer or diastereomer thereof, and compositions including the compounds and methods of using the compounds.本發明係關於式(I)化合物,,其中R1至R3、A及Q係如本文所闡述;及其醫藥上可接受之鹽、其鏡像異構物或非鏡像異構物,及包括該等化合物之組合物以及使用該等化合物之方法。