Patent ID: 7572814

Claim:
A compound of Formula I: or a pharmaceutically acceptable salt thereof, wherein ═X is chosen from ═O and ═N—OR 7 , where R 7 is selected from hydrogen and alkyl, provided that at least one ═X is ═O R 1 is phenyl, which is optionally substituted with one, two, or three groups chosen from halo, lower alkyl, lower alkoxy, and hydroxy; R 2 is phenyl, which is optionally substituted with one, two, or three groups chosen from halo, lower alkyl, lower alkoxy, and hydroxy; R 3 is chosen from hydrogen and alkyl; R 4 is chosen from hydrogen, optionally substituted alkyl, optionally substituted heterocycloalkyl, optionally substituted acyl, optionally substituted aryl, optionally substituted heteroaryl, aminocarbonyl, sulfonyl, optionally substituted alkoxycarbonyl, and optionally substituted cycloalkyl; R 5 is chosen from hydrogen and alkyl; and R 6 is phenyl, which is optionally substituted with one, two, or three groups chosen from halo, lower alkyl, lower alkoxy, and hydroxy provided that: the compound of Formula I is not (1-methyl-4-phenylpiperidine-3,5-diyl)bis(phenylmethanone); (1-benzyl-4-phenylpiperidine-3,5-diyl)bis(phenylmethanone); (1-(2-hydroxyethyl)-4-phenylpiperidine-3,5-diyl)bis(phenylmethanone); or (1-cyclohexyl-4-phenylpiperidine-3,5-diyl)bis(phenylmethanone).