Patent ID: 8372854

Claim:
A compound of Formula I: or a pharmaceutically acceptable salt thereof; wherein: R 1 is selected from the group consisting of hydrogen and (C 1 -C 6 )alkyl; and when R 1 is hydrogen, then R 2 is selected from the group consisting of (C 5 -C 6 )alkyl, halo(C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl(C 1 -C 6 )alkyl, hydroxy(C 5 -C 6 )alkyl, (C 1 -C 6 )alkenyl, halo(C 1 -C 6 )alkenyl, phenyl, phenyl(C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl, heterocyclyl, and heterocyclyl(C 1 -C 6 )alkyl; when R 1 is (C 1 -C 6 )alkyl, then R 2 is selected from the group consisting of (C 1 -C 6 )alkyl, halo(C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl(C 1 -C 6 )alkyl, hydroxy(C 1 -C 6 )alkyl, (C 1 -C 6 )alkenyl, phenyl, phenyl(C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl, heterocyclyl, and heterocyclyl(C 1 -C 6 )alkyl; wherein (C 3 -C 6 )cycloalkyl, wherever it occurs, is optionally substituted with one or more substituents selected from the group consisting of hydroxy(C 1 -C 6 )alkyl, phenyl, phenyl(C 1 -C 6 )alkyl, and (C 1 -C 6 )alkoxycarbonylamino; and wherein when R 1 is hydrogen and R 2 is cyclobutyl, then the cyclobutyl is substituted with one or more substituents selected from the group consisting of hydroxy(C 1 -C 6 )alkyl, phenyl, halophenyl, phenyl(C 1 -C 6 )alkyl, and (C 1 -C 6 )alkoxycarbonylamino; wherein phenyl, wherever it occurs, is optionally substituted with one or more substituents independently selected from the group consisting of cyano, halo, hydroxy, (C 1 -C 6 )alkyl, halo(C 1 -C 6 )alkyl, cyano(C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, aminosulfonyl, and (C 1 -C 6 )alkylaminosulfonyl; wherein heterocyclyl, wherever it occurs, is optionally substituted with one or more substituents independently selected from the group consisting of halo, (C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, amino, and (C 1 -C 6 )alkylamino; and wherein the (C 1 -C 6 )alkyl in phenyl(C 1 -C 6 )alkyl and heterocyclyl(C 1 -C 6 )alkyl is optionally substituted with one more substituents independently selected from the group consisting of halo and hydroxy; and R 3 selected from the group consisting of hydrogen and (C 1 -C 6 )alkyl.