title: Diterpenoids from the pericarp of Platycladus orientalis.
abstract: Eight labdane-type diterpenes, 7beta,13S-dihydroxylabda-8(17),14-dien-19-oic acid (1), 12R,15-dihydroxylabda-8(17),13E-dien-19-oic acid (3c), 12R,15-dihydroxylabda-8(17),13Z-dien-19-oic acid (3d), 12R,13R,14S-trihydroxylabda-12,15-epoxy-8(17)-en-19-oic acid (4a), 12S,13S,14R-trihydroxylabda-12,15-epoxy-8(17)-en-19-oic acid (4b), 15-hydroxy-12-oxolabda-8(17),13E-dien-19-oic acid (5), 14R,15-dihydroxylabda-8(17),12Z-dien-19-oic acid (7a) and 14S,15-dihydroxylabda-8(17),12Z-dien-19-oic acid (7b), along with 20 known diterpenoids, were isolated from the pericarp of Platycladus orientalis. Their structures were unambiguously elucidated by NMR spectroscopic and single crystal X-ray diffraction analyses, as well as via chemical correlation conversion. NMR spectroscopic data of known isomers 8c and 8d were reported as a supplement to existing data.
authors.affiliation: State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-Chong-Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, PR China.
authors.forename: Ya-Zhou
authors.initials: YZ
authors.lastname: Wang
authors.forename: Chun-Ping
authors.initials: CP
authors.lastname: Tang
authors.forename: Chang-Qiang
authors.initials: CQ
authors.lastname: Ke
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Weiss
authors.forename: Ernst-Rudolf
authors.initials: ER
authors.lastname: Gesing
authors.forename: Yang
authors.initials: Y
authors.lastname: Ye
mesh_terms: D029779:Cupressaceae / Q000033:anatomy & histology* / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry*; D005638:Fruit / Q000033:anatomy & histology* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure
chemical_list: D004224:Diterpenes