Patent ID: 8148367

Claim:
A compound of the formula or a pharmaceutically acceptable salt thereof, wherein C a denotes a carbon atom; N a denotes a nitrogen atom; R 1 is selected from wherein m is 0, 1, 2, 3 or 4; l is 0, 1, 2 or 3; and each R 13 is selected from alkyl, halo, and alkoxy; R 2 is selected from methyl, isobutyl, —CH 2 C(O)NH 2 , —CH 2 CH 2 OCH 3 , —CH 2 CH 2 ═CH 2 , wherein R 40 is selected from H, fluoro, chloro, methyl, and methoxy; and R 41 is selected from isopropyl and isobutyl; R 3 is selected from wherein R 24 is selected from hydrogen, alkyl, aryl, and heteroaryl; R 37 is selected from hydrogen, (C 1-8 )alkyl, (C 1-4 )alkoxy(C 1-8 )alkyl; and R 38 is selected from (C 1-8 )alkyl, (C 1-4 )alkoxy(C 1-8 )alkyl, and —(C 1-8 )alkyl-NHC(O)(C 1-4 )alkyl; R 4 is selected from hydrogen, (C 1-6 )alkyl, —CH 2 N(R 28 )C(O)R 29 , —(CH 2 ) n OR 28 , wherein n is 1, 2, or 3; R 28 is hydrogen; and R 29 is phenyl.