The invention is concerned with a compound of formula (I)
wherein R1, R2, R2′, R3, R3′ are as defined in the description and in the claims. The compound of formula (I) can be used as a medicament.
该发明涉及一种化合物,其
化学式为(I),其中R1,R2,R2',R3,R3'如说明书和权利要求中所定义。化合物(I)可用作药物。