Patent ID: 8877967

Claim:
A compound of formula I: or a solvate or pharmaceutically acceptable salt thereof, wherein X is selected from the group consisting of C(═O), CH(OR 6 ) and n is 0, 1, 2 or 3; m is 0, 1, 2 or 3; p is 0, 1, 2 or 3; R 1 is hydrogen, C 1 -C 3 alkyl, aryl and arylalkyl; R 2 is hydrogen or C 1 -C 3 alkyl; each R 3 and R 5 independently is selected from the group consisting of hydroxyl, C 1 -C 3 alkyl, C 1 -C 2 alkoxy, fluoro, and chloro; each R 4 independently is selected from the group consisting of hydroxyl, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, halo, amino, nitro, nitroso and acyl; and R 6 is selected from the group consisting of hydrogen and methyl.