The invention relates to a compound of formula (I)
wherein A
1
to A
3
and R
1
to R
3
are defined as 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A1至A3和R1至R3的定义如说明书和权利要求书所述。该化合物可以作为药物使用。