title: ent-Labdane diterpenes from the stems of Mallotus japonicus.
abstract: Eight new ent-labdane diterpenoids, mallonicusins A-H (1-8), were isolated from the stems of Mallotus japonicus. Their structures, including the absolute configurations, were determined by extensive analyses of spectroscopic data and the ECD spectra of the Pr(FOD)₃ complex of substrates in CCl₄. The absolute configuration of compound 1 was confirmed by single-crystal X-ray crystallography using Cu Kα radiation.
authors.affiliation: State Key Laboratory of Drug Research & SIMM-CUHK Joint Research Laboratory for Promoting Globalization of Traditional Chinese Medicines, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , 555 Zu-Chong-Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People's Republic of China.
authors.forename: De-Zheng
authors.initials: DZ
authors.lastname: Li
authors.forename: Chunping
authors.initials: C
authors.lastname: Tang
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Quinn
authors.forename: Yunjiang
authors.initials: Y
authors.lastname: Feng
authors.forename: Chang-Qiang
authors.initials: CQ
authors.lastname: Ke
authors.forename: Sheng
authors.initials: S
authors.lastname: Yao
authors.forename: Yang
authors.initials: Y
authors.lastname: Ye
mesh_terms: D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D036461:Mallotus Plant / Q000737:chemistry*; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry
chemical_list: D004224:Diterpenes; D004365:Drugs, Chinese Herbal