Patent ID: 8476457

Claim:
A compound of formula III: or a pharmaceutically acceptable salt thereof, wherein: R 1 is: C 1-6 alkyl; or halo; R 2 is: C 3-6 cycloalkyl; C 1-6 alkoxy-C 1-6 alkyl; hydroxy-C 1-6 alkyl; or heteroaryl-C 1-6 alkyl selected from: pyrazinyl-methyl; pyridazinyl-methyl; pyrimidinyl-methyl; 1-pyrazinyl-ethyl; 1-pyridazinyl-ethyl; and 1-pyrimidinyl-ethyl; wherein the pyrazinyl, pyridazinyl and pyrimidinyl portions thereof may be optionally substituted once with methyl; R 3 is: C 1-6 alkyl; hydroxy-C 1-6 alkyl; C 1-6 alkoxy-C 1-6 alkyl; halo-C 1-6 alkyl; C 3-6 cycloalkyl; C 3-6 cycloalkyl-C 1-6 alkyl; phenyl optionally substituted with: halo, C 1-6 alkyl, C 1-6 alkoxy or halo-C 1-6 alkyl; or phenyl-C 1-6 alkyl wherein the phenyl portion thereof is optionally substituted with: halo, C 1-6 alkyl, C 1-6 alkoxy or halo-C 1-6 alkyl; and X is: N or CR a wherein R a is hydrogen, C 1-6 alkyl or halo.