title: Glyyunnansapogenins G and H: Two New Pentacyclic Triterpenoids of the 18alphaH-Oleana-9(11),12-diene Type from Glycyrrhiza yunnanensis Roots.
abstract: Two new pentacyclic triterpenoid sapogenins of the 18alpha H-oleana-9(11),12-diene type named glyyunnansapogenins G and H were isolated from the roots of GLYCYRRHIZA YUNNANENSIS Cheng f. et L. K. Tai. Their structures were elucidated as 18alpha H-oleana-9(11),12-diene-3beta,21alpha,29-triol and 18alpha H-3beta,21alpha-dihydroxyoleana-9(11),12-dien-29-oic acid, respectively, by spectroscopic methods. This is the first report of the occurrence of the 18alpha H series of oleana-9(11),12-diene compounds in nature.
authors.affiliation: School of Pharmaceutical Sciences, Beijing Medical University, Beijing 100083, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Zeng
authors.forename: R Y
authors.initials: RY
authors.lastname: Zhang
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: Z L
authors.initials: ZL
authors.lastname: Zhang
authors.forename: Z C
authors.initials: ZC
authors.lastname: Lou