title: Two isomeric epoxysitosterols from Rhododendron formosanum: 1H and 13C NMR chemical shift assignments.
abstract: 1H and 13C NMR assignments of the two isomeric epoxysitosterols, 5,6 alpha-epoxy-5 alpha-stigmastan-3 beta-ol (1) and 5,6 beta-epoxy-5 beta-stigmastan-3 beta-ol (2), isolated from the leaves of Rhododendron formosanum Hemsl were achieved by 1D and 2D techniques such as DEPT, HMBC, HMQC, COSY and NOESY.
authors.affiliation: Department of Life Sciences, National SunYat-sen University, Kaohsiung, 804, Taiwan.
authors.forename: Vivek
authors.initials: V
authors.lastname: Krishna
authors.forename: Chi-I
authors.initials: CI
authors.lastname: Chang
authors.forename: Chang-Hung
authors.initials: CH
authors.lastname: Chou
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D002776:Cholestanes / Q000737:chemistry* / Q000302:isolation & purification; D006859:Hydrogen / Q000032:analysis; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D029793:Rhododendron / Q000737:chemistry*; D013261:Sterols / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: C522234:5,6-epoxystigmastan-3-ol; D002247:Carbon Isotopes; D002776:Cholestanes; D013261:Sterols; D006859:Hydrogen