Patent ID: 7998963

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: m is from 1 to 3; n is from 0 to 2; Ar is: indolyl; indazolyl; or 2,3-dihydro-indolyl, each optionally substituted with halo, C 1-6 alkyl or C 1-6 alkoxy; R 1 is: hydrogen; or C 1-6 alkyl; R 2 is: C 3-6 alkyl; C 1-6 alkoxy-C 1-3 alkyl; hydroxy-C 1-6 alkyl; C 3-6 cycloalkyl; C 3-6 cycloalkyl-C 1-3 alkyl; C 3-6 cycloalkyloxy-C 1-3 alkyl; or C 3-6 cycloalkyl-C 1-3 alkoxy-C 1-3 alkyl; R 3 is: hydrogen; or C 1-6 alkyl; or R 2 and R 3 together with the atom to which they are attached may form a C 3-6 cycloalkyl; R 4 is: hydrogen; or C 1-6 alkyl.