| abstract |
The invention provides compounds having the general formula: [insert formula (I)] (I) and pharmaceutically acceptable salts thereof, wherein the variables R A , subscript n, ring A, X 2 , L, subscript m, X 1 , R 1 , R 2 , R 3 , R 4 , and R N have the meaning as described herein, and compositions containing such compounds and methods for using such compounds and compositions. |