title: Seven new dammarane triterpenes from the floral spikes of Betula platyphylla var. japonica.
abstract: Seven new dammarane-type triterpenoids, including two 20(S)-hydroxy-25-methoxy-dammar-23-enes (1 and 2), two 20(S),24(R)-epoxydammaranes (3 and 4), a cabralealactone (5), and two 20(S),25-epoxydammaranes (6 and 7), together with seven known triterpenes (8-14), were isolated from the floral spikes of Betula platyphylla var. japonica. The structures for all compounds were elucidated by the analyses of extensive spectroscopic data, as well as chemical examinations.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan.
authors.forename: Juan
authors.initials: J
authors.lastname: Xiong
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Taniguchi
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kashiwada
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamagishi
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Takaishi
mesh_terms: D029662:Betula / Q000737:chemistry*; D035263:Flowering Tops / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D014315:Triterpenes / Q000737:chemistry*
chemical_list: D014315:Triterpenes
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