Patent ID: 8703794

Claim:
A compound, or a pharmaceutically acceptable salt thereof, having the structure of Formula Ia: wherein: R 1 , R 2 , R 4 , R 7 , and R 9 are all H; R 6 is -(C 1-9 alkyl) n arylR 13 ; R 3 is -heteroarylR 14 R 15 ; R 10 is independently selected from the group consisting of -C 1-9 alkyl and -(C 1-9 alkyl) n carbocyclyl; R 13 is 1-5 substituents each selected from the group consisting of H, C 1-9 alkyl, and halide; R 14 is —NHC(═O)R 10 ; R 15 is H; Y 1 , Y 2 , and Y 4 are C; Y 3 is nitrogen and R 8 is absent; and each n is 0 or 1.