title: Two new ent-3,4-seco-labdane diterpenoids from Callicarpa nudiflora.
abstract: Two new ent-3,4-seco-labdane diterpenoids, methylcallicarpate (1) and callicarpic acid (2), were isolated from the leaves of Callicarpa nudiflora Hook et Arn. Their structures and relative configurations were established by analysis of spectroscopic data. Their absolute configurations were assigned by the application of the CD technique for the first time among the ent-3,4-seco-labdane-type diterpenes.
authors.affiliation: Hainan Provincial Key Laboratory of R&D on Tropical Medicinal Plants, Hainan Medical College, Haikou 571199, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Dong
authors.forename: Xiao-Po
authors.initials: XP
authors.lastname: Zhang
authors.forename: Ming-Sheng
authors.initials: MS
authors.lastname: Liu
authors.forename: Yan-Mei
authors.initials: YM
authors.lastname: Li
authors.forename: Jin-Hui
authors.initials: JH
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
mesh_terms: D032408:Callicarpa / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D004224:Diterpenes; D004365:Drugs, Chinese Herbal; C579448:callicarpic acid; C433017:labdane; C579447:methylcallicarpate