Patent ID: 8809402

Claim:
A compound of formula I: 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; pyrazinyl-ethyl; pyridazinyl-ethyl; pyrimidinyl-ethyl; wherein the pyrazinyl, pyridazinyl and pyrimidinyl portions thereof may be optionally substituted once with methyl; R 3 is: ethyl; or isopropyl; R 4 is: hydrogen; halo; C 1-6 alkyl; or R 3 and R 4 together with the atom to which they are attached may form C 3-6 cycloalkyl; R 5 , R 6 and R 7 each independently is fluoro or hydrogen; X is: —CR a — wherein R a is hydrogen, C 1-6 alkyl or halo; and Y is: —O—; —CHR b —;or —NR c —; wherein R b and R c each independently is hydrogen or C 1-6 alkyl.