| abstract |
Compounds and pharmaceutically acceptable salts of the compounds are disclosed, wherein the compounds have the structure of Formula I: (I) wherein A1, A2, A3, A4, A5, A6, A7, A8, X4, X6, R2a, Rx, R4, R5, and R6 are as defined in the detailed description of the invention. Corresponding pharmaceutical compositions, methods of treatment, methods of synthesis, and intermediates are also disclosed. |