title: 8,12;8,20-Diepoxy-8,14-secopregnane glycosides from the aerial parts of Asclepias tuberosa.
abstract: Further study of constituents from the aerial parts of Asclepias tuberosa afforded twenty-two new steroidal glycosides along with tuberoside B(5) and G(5). These glycosides were confirmed to contain 8,12;8,20-diepoxy-8,14-secopregnanes, tuberogenin and its congeners, as their aglycones. The structure of each of these compounds was elucidated based on the interpretation of NMR and MS measurements and from chemical evidence.
authors.affiliation: Institute for Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan. warashin@u-shizuoka-ken.ac.jp
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Warashina
authors.forename: Tadataka
authors.initials: T
authors.lastname: Noro
mesh_terms: D031108:Asclepias / Q000737:chemistry*; D006027:Glycosides / Q000032:analysis* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry*; D012503:Saponins / Q000032:analysis / Q000302:isolation & purification; D013256:Steroids / Q000032:analysis / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D012503:Saponins; D013256:Steroids; C436828:tuberoside