The invention relates to a compound of formula (I) wherein A1, A2 and R1to R3 are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
这项发明涉及一种化合物,其
化学式为(I),其中A1,A2和R1至R3的定义如描述和索赔中所述。化合物的
化学式(I)可用作药物。