Patent ID: 8754099

Claim:
A compound of structural formula I: and pharmaceutically acceptable salts thereof, wherein: R 1 is selected from the group consisting of: (1) —C 1-6 alkyl-O—C 1-6 alkyl, (2) —C 1-6 alkyl-O—C 1-6 alkyl-O—C 1-6 alkyl, (3) —C 3-10 cycloalkyl, and (4) —C 3-10 cycloheteroalkyl, wherein alkyl, cycloalkyl and cycloheteroalkyl are unsubstituted or substituted with one to three substituents independently selected from R a ; each R 2 is independently selected from the group consisting of: (1) —C 1-6 alkyl, (2) —C 1-6 alkyl-O—C 1-6 alkyl, and (3) —C 3-6 cycloheteroalkyl, wherein alkyl and cycloheteroalkyl are unsubstituted or substituted with one to three substituents independently selected from R f ; R 3 , R 4 , R 5 , R 7 , R 8 , R 9 , R 10 , and R 11 are each hydrogen; R 6 is pyridine, wherein pyridine is substituted with two substituents independently selected from R i ; each R a is independently selected from the group consisting of: (1) —C 1-6 alkyl, (2) —OC 1-6 alkyl, (5) halogen, (18) —CF 3 , (19) —OCF 3 , and (20) —OCHF 2 ; R f is selected from the group consisting of: (1) halogen, and (2) —C 1-10 alkyl, unsubstituted or substituted with one to five fluorines; each R i is independently selected from the group consisting of: (3) halogen, (16) —CF 3 , (17) —OCF 3 , (18) —OCHF 2 , and (19) —C 1-10 alkyl; and n is 0, 1, 2, 3 or 4; or a pharmaceutically acceptable salt thereof.