The invention relates to compounds of formula (I) wherein R
1
, R
2
, R
3
, R
4
, A, B, W and n are as defined in the description, and to pharmaceutically acceptable salts of such compounds. These compounds are useful as calcium channel blockers.
The invention relates to compounds of formula (I) wherein R1, R2, R3, R4, A, B, W and n are as defined in the description, and to pharmaceutically acceptable salts of such compounds. These compounds are useful as calcium channel blockers.