The invention relates to a compound of formula (I)
wherein A
1
to A
4
and R
1
to R
6
are defined as in the description and in the claims. The compound of formula (I) can be used, for example, as inhibitors of the cysteine protease cathepsin.
The invention relates to a compound of formula (I)
wherein A1 to A4 and R1 to R6 are defined as in the description and in the claims. The compound of formula (I) can be used, for example, as inhibitors of the cysteine protease cathepsin.