The present invention relates to compounds of formula (I), wherein R1 to R4 are as described herein, and their pharmaceutically acceptable salt, enantiomer or diastereomer thereof, and compositions including the compounds and methods of using the compounds.
本发明涉及式(I)的化合物,其中R1至R4如本文所述,并且包括其药用可接受盐、对映体或
二对映体,以及包括这些化合物的组合物和使用这些化合物的方法。