Patent ID: 7317026

Claim:
A compound represented by the following structural formula: or a pharmaceutically acceptable salt thereof, wherein: ( - - - ) represents a double bond; X 1 is —O—; n is an integer from 1 to 6; the aryl rings are each optionally and independently substituted; the alkylene spacer molecule between the piperidine and the —CO 2 R group is substituted with a cyclic alkyl or a heterocycle, wherein one or more of the carbons of the spacer molecule is contained in the cyclic alkyl or the heterocycle; and R is —H, 2-propyl, 2-butyl, 2-pentyl, cyclopentyl, cyclohexyl, 3-tetrahydrofuryl, 3-pentyl, 1,3-dimethoxy-2-propyl, 4-tetrahydropyranyl, 2,4-dimethyl-3-pentyl, 1-methoxy-2-propyl, 1-3-diethoxy-2-propyl, or 2,2′dimethyl-1-propyl.