Patent ID: 7786110

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: R 1 is a group of formula A or formula B; wherein: X is —S— or —O—; and R a and R b each independently is: hydrogen; C 1-6 alkyl; C 1-6 alkoxyl; C 1-6 alkylsulfonyl-C 1-6 alkyl; halo-C 1-6 alkyl; halo-C 1-6 alkoxy; hetero-C 1-6 alkyl; C 3-6 -cycloalkyl; C 3-6 cycloalkyl-C 1-6 alkyl; aminocarbonyl; C 1-6 alkoxycarbonyl; or cyano; R 2 is: optionally substituted phenyl; R 3 is: hydrogen; or C 1-6 alkyl; R 4 is: hydrogen; or C 1-6 alkyl; or R 3 and R 4 together with the atom to which they are attached may form a C 3-6 carbocyclic ring; R 5 is: C 1-6 alkyl; C 1-6 alkyloxy-C 1-6 alkyl; hydroxy-C 1-6 alkyl; C 1-6 alkylsulfanyl-C 1-6 alkyl; C 1-6 alkylsulfonyl-C 1-6 alkyl; amino-C 1-6 alkyl; N—C 1-6 alkylamino; N,N-di-(C 1-6 alkyl)-amino; C 3-7 cycloalkyl; optionally substituted phenyl; heteroaryl; or heterocyclyl-C 1-6 alkyl; or R 4 and R 5 together with the atom to which they are attached may form a C 3-6 carbocyclic ring that is optionally substituted with hydroxy; and R 6 is: hydrogen; C 1-6 alkyl; C 1-6 alkyloxy; halo; C 1-6 haloalkyl; halo-C 1-6 alkoxy; or cyano.