title: Two New Steroidal Saponins from Ypsilandra thibetica.
abstract: Two new monosaccharide steroidal saponins, named ypsilandroside S (1) and ypsilandroside T (2), have been isolated from the whole plants of Ypsilandra thibetica. Their structures were elucidated as heloniogenin 3-O-β-D-apiofuranoside (1) and pregna 5,16-dien-3β,12α-diol-20-one-3-O-β-D-apiofuranoside (2) by spectroscopic techniques (1D and 2D NMR, MS). Compounds 1 and 2 were tested for their inhibitory effects on lipopolysaccharide-induced nitric oxide production in RAW 264.7 cells.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Yong-Ai
authors.initials: YA
authors.lastname: Si
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ni
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Zhen-Hua
authors.initials: ZH
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
authors.forename: Ting-Xiang
authors.initials: TX
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
authors.forename: Chang-Xiang
authors.initials: CX
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China. haiyangliu@mail.kib.ac.cn.
authors.forename: Hai-Yang
authors.initials: HY
authors.lastname: Liu
keywords: Liliaceae; Ypsilandra thibetica; Ypsilandroside S; Ypsilandroside T