| abstract |
The invention is directed to compounds of formula I: n n n n n n n n n n n n wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7a , R 7b , W, G 1 , G 2 , a, b, c, d and m are as defined in the specification, or a pharmaceutically acceptable salt or solvate or stereoisomer thereof. The invention is also directed to pharmaceutical compositions comprising such compounds; methods of using such compounds; and process and intermediates for preparing such compounds. |