title: Four new clerodane diterpenoids from Callicarpa pentandra.
abstract: Leaf extracts of Callicarpa pentandra provided four new clerodane-type diterpenoids (1-4), of which 1, 2, and 4 have ring-A-contracted structures. Their structures and stereochemistry were established by spectral data interpretation, and for 3 also by single-crystal X-ray diffraction.
authors.affiliation: Chemistry Department, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: L J
authors.initials: LJ
authors.lastname: Harrison
authors.forename: J J
authors.initials: JJ
authors.lastname: Vittal
authors.forename: Y J
authors.initials: YJ
authors.lastname: Xu
authors.forename: S H
authors.initials: SH
authors.lastname: Goh
mesh_terms: D002853:Chromatography, Liquid; D002855:Chromatography, Thin Layer; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008296:Malaysia; D008519:Medicine, Traditional; D009904:Optical Rotation; D008517:Phytotherapy; D018515:Plant Leaves / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004224:Diterpenes