A compound of formula I or I' or a pharmaceutically acceptable salt thereof, wherein, independently for each occurrence: G is X is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R X is absent, H, or C 3 -C 8 cycloaliphatic, wherein up to two non-adjacent CH 2 units of said C 3 -C 8 cycloaliphatic may be replaced with -O- and said C 3 -C 8 cycloaliphatic is substituted with 0-3 substituents selected from halogen and C 1 -C 4 alkyl; R 1 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen and wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 2 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 3 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 4 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 5 is H, halogen, CN, or -X-R X; R 5' is H, halogen, CN, or -X-R X; R 6 is H, halogen, CN, or -X-R X; R 6' is H, halogen, CN, or -X-R X; R 7 is H, halogen, CN, or -X-R X; R 8 is halogen, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; p is an integer from 0 to 3 inclusive; and R 9 is H, or C 1 -C 6 alkyl wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-. G is X is a bond or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R X is absent, H, or C 3 -C 8 cycloaliphatic, wherein up to two non-adjacent CH 2 units of said C 3 -C 8 cycloaliphatic may be replaced with -O- and said C 3 -C 8 cycloaliphatic is substituted with 0-3 substituents selected from halogen and C 1 -C 4 alkyl; R 1 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen and wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 2 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 3 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 4 is H, halogen, CN, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; R 5 is H, halogen, CN, or -X-R X; R 5' is H, halogen, CN, or -X-R X; R 6 is H, halogen, CN, or -X-R X; R 6' is H, halogen, CN, or -X-R X; R 7 is H, halogen, CN, or -X-R X; R 8 is halogen, or C 1 -C 6 alkyl wherein said C 1 -C 6 alkyl is substituted with 0-6 halogen, wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-; p is an integer from 0 to 3 inclusive; and R 9 is H, or C 1 -C 6 alkyl wherein up to two non-adjacent CH 2 units of said C 1 -C 6 alkyl may be replaced with -O-.