The invention relates to a compound of formula (I):
or a tautomer thereof or a pharmaceutically acceptable salt thereof, wherein R
1
to R
11
, W, X, Y, Z, and n are as defined herein. The invention also relates to methods of using the compounds of formula (I) and compositions thereof to treat various diseases and disorders in a patient. The invention also relates to processes for preparing the compounds of formula (I) and intermediates useful in these processes.