Patent ID: 7595345

Claim:
A compound represented by a formula below or a pharmaceutically acceptable salt thereof: wherein; R and R′ are independently C 1 -C 5 alkyl; R1 and R2 are independently hydrogen or C 1 -C 5 alkyl; L 1 is a divalent linking group selected from: a bond, L 2 is a divalent linking group selected from: a bond and where m is 0, 1 or 2, and each R40 is independently hydrogen, C 1 -C 5 alkyl, or C 1 -C 5 fluoroalkyl; R BOH is 3-methyl-3-hydroxypentyl, 3-methyl-3-hydroxypentenyl, 3-methyl-3-hydroxypentynyl, 3-ethyl-3-hydroxypentyl, 3-ethyl-3-hydroxypentenyl, 3-ethyl-3-hydroxypentynyl, 3-ethyl-3-hydroxy-4-methylpentyl, 3-ethyl-3-hydroxy-4-methylpentenyl, 3-ethyl-3-hydroxy-4-methylpentynyl, 3-propyl-3-hydroxypentyl, 3-propyl-3-hydroxypentenyl, 3-propyl-3-hydroxypentynyl, 1-hydroxy-2-methyl-1-(methylethyl)propyl, 1-hydroxycyclopropyl, 1-hydroxycyclobutyl, 1-hydroxycyclopentyl, or 1-hydroxycyclohexyl; provided, however, provided that when R BOH is 3-methyl-3-hydroxypentyl, 3-methyl-3-hydroxypentenyl, 3-methyl-3-hydroxypentynyl, 3-ethyl-3-hydroxypentyl, 3-ethyl-3-hydroxypentenyl, 3-ethyl-3-hydroxypentynyl, 3-ethyl-3-hydroxy-4-methylpentyl, 3-ethyl-3-hydroxy-4-methylpentenyl, 3-ethyl-3-hydroxy-4-methylpentynyl, 3-propyl-3-hydroxypentyl, 3-propyl-3-hydroxypentenyl, 3-propyl-3-hydroxypentynyl, or 1-hydroxy-2-methyl-1-(methylethyl)propyl; then L 1 and L 2 combine as a bond; and R C is —C(O)NH—CH 2 —C(O)OH, —C(O)NH—CH(Me)-C(O)OH, —C(O)NH—C(Me) 2 -C(O)OH, —C(O)NMe-CH 2 —C(O)OH, —C(O)NMe-CH(Me)-C(O)OH, —C(O)NMe-C(Me) 2 -C(O)OH, or -5-tetrazolyl.