Patent ID: 8623888

Claim:
A compound of Formula (I) or a pharmaceutically acceptable salt thereof: wherein: R is selected from the group consisting of (i) n-butyl, isobutyl, cyclobutyl, n-pentyl, cyclopentyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, ethylhexyl, n-nonanyl, n-dodecanyl, n-tridecanyl, n-tetradecanyl, n-pentadecanyl, n-hexadecanyl, n-heptadecanyl, n-octadecanyl, n-iconsanyl, n-hemicosanyl, n-docosanyl, n-tricosanyl, n-tetracosanyl, n-heptacosanyl, benzyl, thienyl, thienylmethyl, furanyl, tetryhydrofuranyl, methylthiomethyl, camphanyl, norbornanyl, methyglutaryl, methylsuccinyl, and methyladipoyl, wherein the optical activity of the compound is (−), or (ii) ethyl, propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, s-butyl, t-butyl, cyclobutyl, n-pentyl, cyclopentyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, ethylhexyl, n-nonanyl, n-dodecanyl, n-tridecanyl, n-tetradecanyl, n-pentadecanyl, n-hexadecanyl, n-heptadecanyl, n-octadecanyl, n-iconsanyl, n-hemicosanyl, n-docosanyl, n-tricosanyl, n-tetracosanyl, n-heptacosanyl, benzyl, phenyl, thienyl, thienylmethyl, furanyl, tetryhydrofuranyl, methylthiomethyl, camphanyl, norbornanyl, methyglutaryl, methylsuccinyl, and methyladipoyl, wherein the optical activity of the compound is (+); R 1 and R 2 are independently selected from the group consisting of hydrogen, halogen, {—}OH, {—}OR 7 , hydrocarbyl, and substituted hydrocarbyl; and R 3 , R 4 , R 5 , R 6 , and R 7 , are independently selected from the group consisting of hydrogen, hydrocarbyl, and substituted hydrocarbyl.