title: Cytotoxic ent-kaurane diterpenoids from Isodon rubescens var. rubescens.
abstract: Five new ent-kauranoids, xindongnins C - G ( 1 - 5), together with five known ones, xindongnins A and B ( 6 and 7), melissoidesin G ( 8), dawoensin A ( 9), and glabcensin V ( 10), were isolated from the leaves of Isodon rubescens var. rubescens, and structurally elucidated. Compounds 1, 4, and 6 - 10 showed inhibitory effects against human tumor K562 cells with IC (50) values ranging from 0.3 to 7.3 microg/mL. The structure of 6 was revised on the basis of its 2D-NMR spectral data.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, P. R. China.
authors.forename: Quan-Bin
authors.initials: QB
authors.lastname: Han
authors.forename: Wei
authors.initials: W
authors.lastname: Xiang
authors.forename: Rong-Tao
authors.initials: RT
authors.lastname: Li
authors.forename: Ma-Lin
authors.initials: ML
authors.lastname: Li
authors.forename: Si-Wei
authors.initials: SW
authors.lastname: Li
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Sun
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D045786:Diterpenes, Kaurane / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D020128:Inhibitory Concentration 50; D037602:Isodon; D020014:K562 Cells / Q000187:drug effects; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D018515:Plant Leaves
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D045786:Diterpenes, Kaurane; D010936:Plant Extracts