title: Przewalskin B, a novel diterpenoid with an unprecedented skeleton from Salvia przewalskii maxim.
abstract: Przewalskin B (1), a novel diterpenoid possessing a unique skeleton, was isolated from a Chinese medicinal plant Salvia przewalskii. Its structure and relative stereochemistry were elucidated by extensive NMR analysis and a single-crystal X-ray study. A possible biosynthetic pathway for 1 was proposed. Compound 1 exhibited modest anti-HIV-1 activity with EC50 = 30 microg/mL. [structure: see text].
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, Yunnan, PRC.
authors.forename: Gang
authors.initials: G
authors.lastname: Xu
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Hou
authors.forename: Yong-Tang
authors.initials: YT
authors.lastname: Zheng
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Li
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Peng
authors.forename: Qin-Shi
authors.initials: QS
authors.lastname: Zhao
mesh_terms: D019380:Anti-HIV Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D015497:HIV-1 / Q000187:drug effects*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D008968:Molecular Conformation; D010946:Plants, Medicinal / Q000737:chemistry*; D012015:Reference Standards; D027544:Salvia / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D019380:Anti-HIV Agents; D004224:Diterpenes; C518012:Przewalskin B