title: Four new triterpenes from the endemic relict shrub Tetraena mongolica.
abstract: A chemical investigation of the endemic relict shrub Tetraena mongolica led to the isolation of four new triterpenes: 11α,12α:13β,28-diepoxyoleanane-3β-yl trans-caffeate (1), 3β-hydroxy-11α,12α-epoxyoleanane-28-al (2), olean-11-en-28-al-3β-yl trans-caffeate (3), and 28-acetoxy-olean-12-en-3β-yl trans-caffeate (4). Their structures were elucidated by extensive spectroscopic methods.
authors.affiliation: Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Research Center of basic Medical Sciences, Tianjin Medical University, Tianjin, China.
authors.forename: Sheng-An
authors.initials: SA
authors.lastname: Tang
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Ding
authors.forename: Hui-Yuan
authors.initials: HY
authors.lastname: Zhai
authors.forename: Nan
authors.initials: N
authors.lastname: Qin
authors.forename: Hong-Quan
authors.initials: HQ
authors.lastname: Duan
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*; D028461:Zygophyllaceae / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D014315:Triterpenes; C576860:gypenbioside A