Compounds and pharmaceutically acceptable salts of the compounds are disclosed, wherein the compounds have the structure of Formula I wherein X, R1, R2a, R2b, R4a, R4b, R5a, R5b, R6, R7, R10, R11, and y are as defined in the specification. Corresponding pharmaceutical compositions, methods of treatment, methods of synthesis, and intermediates are also disclosed.本發明揭示化合物及該等化合物之醫藥上可接受之鹽，其中該等化合物具有式I結構，其中X、R1、R2a、R2b、R4a、R4b、R5a、R5b、R6、R7、R10、R11、及y係如說明書中所定義。本文亦揭示對應醫藥組合物、治療方法、合成方法、及中間產物。
