A compound having formula: or a pharmaceutically acceptable salt thereof, wherein Ar 1 is a 5- to 6-membered heteroaryl having at least one nitrogen atom ring member; and which is optionally substituted with from 1-3 R a; Ar 2 is a 5- to 10-membered aryl or heteroaryl, which is optionally substituted with from 1-5 R b; R 1 and R 2 are each independently a member selected from the group consisting of H, F, C 1 -C 4 alkyl, C 1 -C 4 deuteroalkyl, and C 1 -C 4 haloalkyl; or optionally R 1 and R 2 can be combined to form a C 3 - to C 5 carbocyclic ring, which is optionally substituted with one or two F; R 3 is a member selected from the group consisting of H, F, OH and C 1 -C 4 alkyl; each R a is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 hydroxyalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, -COR a1, -CO 2 R a1, -SO 2 R a1, - SO 2 NR a1 R a2, and -CONR a1 R a2, wherein each R a1 and R a2 is independently selected from the group consisting of H and C 1 -C 4 alkyl, or optionally R a1 and R a2 when attached to a nitrogen atom are combined to form a 4- to 6- membered ring; or optionally, two R a substituents on adjacent ring members are combined to form a 5- or 6-membered ring having 0, 1 or 2 ring members selected from O, N and S; and each R b is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 deuteroalkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, C 3 -C 6 cycloalkyl, -NR b1 R b2, -COR b1, -CO 2 R b1, -SO 2 R b1, -SO 2 NR b1 R b2, -CONR b1 R b2, and a 5- or 6-membered heteroaryl, which is optionally substituted with C 1 -C 4 alkyl, and wherein each R b1 and R b2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R b1 and R b2 when attached to a nitrogen atom are combined to form a 4- to 6- membered ring; or optionally, two R b substituents on adjacent ring members are combined to form a 5- or 6-membered ring having 0, 1 or 2 ring members selected from O, N and S. or a pharmaceutically acceptable salt thereof, wherein Ar 1 is a 5- to 6-membered heteroaryl having at least one nitrogen atom ring member; and which is optionally substituted with from 1-3 R a; Ar 2 is a 5- to 10-membered aryl or heteroaryl, which is optionally substituted with from 1-5 R b; R 1 and R 2 are each independently a member selected from the group consisting of H, F, C 1 -C 4 alkyl, C 1 -C 4 deuteroalkyl, and C 1 -C 4 haloalkyl; or optionally R 1 and R 2 can be combined to form a C 3 - to C 5 carbocyclic ring, which is optionally substituted with one or two F; R 3 is a member selected from the group consisting of H, F, OH and C 1 -C 4 alkyl; each R a is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 hydroxyalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, -COR a1, -CO 2 R a1, -SO 2 R a1, - SO 2 NR a1 R a2, and -CONR a1 R a2, wherein each R a1 and R a2 is independently selected from the group consisting of H and C 1 -C 4 alkyl, or optionally R a1 and R a2 when attached to a nitrogen atom are combined to form a 4- to 6- membered ring; or optionally, two R a substituents on adjacent ring members are combined to form a 5- or 6-membered ring having 0, 1 or 2 ring members selected from O, N and S; and each R b is independently selected from the group consisting of halo, CN, hydroxyl, C 1 -C 4 alkyl, C 1 -C 4 deuteroalkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, C 3 -C 6 cycloalkyl, -NR b1 R b2, -COR b1, -CO 2 R b1, -SO 2 R b1, -SO 2 NR b1 R b2, -CONR b1 R b2, and a 5- or 6-membered heteroaryl, which is optionally substituted with C 1 -C 4 alkyl, and wherein each R b1 and R b2 is independently selected from the group consisting of H and C 1 -C 4 alkyl or optionally R b1 and R b2 when attached to a nitrogen atom are combined to form a 4- to 6- membered ring; or optionally, two R b substituents on adjacent ring members are combined to form a 5- or 6-membered ring having 0, 1 or 2 ring members selected from O, N and S.