abstract |
The present invention provides a compound of formula (I), or a pharmaceutically acceptable salt thereof. The present invention also relates to the preparation of compounds of formula (I), pharmaceutical compositions containing them and their use as medicaments for the treatment of spinal muscular atrophy. (I) In this formula, A, X 1 , X 2 , R 1 , R 2 , R 3 , R 4 and R 5 are as described herein. |