Patent ID: 8097624

Claim:
A 3-hydroxypyridin-4-one compound of formula I: wherein: R 1 is X with the proviso that R 2 R 5 N are taken together to form a heterocyclic ring selected from the group consisting of piperidinyl, morpholinyl, pyrrolidinyl and piperazinyl, wherein the piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl group is either unsubstituted or substituted with one to three C 1 to C 6 alkyl groups; X is C 3 -C 6 cycloalkyl; R 3 is selected from the group consisting of hydrogen and C 1 to C 6 alkyl; and R 4 is selected from the group consisting of hydrogen and C 1 to C 6 alkyl; or a pharmaceutically acceptable salt thereof.