The invention is concerned with a compound of formula (I)
and pharmaceutically acceptable salts thereof wherein R1 to R3, X and Y are as defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
The invention is concerned with a compound of formula (I)
and pharmaceutically acceptable salts thereof wherein R1 to R3, X and Y are as defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.