title: Polyoxygenated ursane and oleanane triterpenes from Siphonodon celastrineus.
abstract: Twenty polyoxygenated triterpenes, including nineteen ursanes and one oleanane, were characterized from the stem material of Siphonodon celastrineus (Celastraceae) through the application of spectroscopic techniques and chemical transformation. Three of the ursane-type triterpenoids possessed the rare 13,27-cyclopropane ring skeleton.
authors.affiliation: Chulabhorn Research Institute, Kamphaeng Phet 6 Road, Bangkok 10210, Thailand.
authors.forename: Wirongrong
authors.initials: W
authors.lastname: Kaweetripob
authors.affiliation: Chulabhorn Research Institute, Kamphaeng Phet 6 Road, Bangkok 10210, Thailand; Chulabhorn Graduate Institute and Center for Environmental Health and Toxicology (EHT), Kamphaeng Phet 6 Road, Bangkok 10210, Thailand.
authors.forename: Chulabhorn
authors.initials: C
authors.lastname: Mahidol
authors.affiliation: Chulabhorn Research Institute, Kamphaeng Phet 6 Road, Bangkok 10210, Thailand.
authors.forename: Sanit
authors.initials: S
authors.lastname: Thongnest
authors.affiliation: Chulabhorn Research Institute, Kamphaeng Phet 6 Road, Bangkok 10210, Thailand. Electronic address: hunsa@cri.or.th.
authors.forename: Hunsa
authors.initials: H
authors.lastname: Prawat
authors.affiliation: Chulabhorn Research Institute, Kamphaeng Phet 6 Road, Bangkok 10210, Thailand; Chulabhorn Graduate Institute and Center for Environmental Health and Toxicology (EHT), Kamphaeng Phet 6 Road, Bangkok 10210, Thailand.
authors.forename: Somsak
authors.initials: S
authors.lastname: Ruchirawat
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D029753:Celastraceae / Q000737:chemistry*; D004354:Drug Screening Assays, Antitumor; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018547:Plant Stems / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D053978:Pentacyclic Triterpenes
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D009828:Oleanolic Acid; D014315:Triterpenes; C413246:oleanane; C000606873:ursane; D053978:Pentacyclic Triterpenes
keywords: 13,27-Cyclopropane ring triterpenes; Celastraceae; Cytotoxicity; Oleanane; Polyoxygenated pentacyclic triterpenes; Siphonodon celastrineus; Ursane