title: Norlignans from Sequoia sempervirens.
abstract: Six new norlignans, named sequosempervirins B-G (1-6), together with three known norlignans, agatharesinol (7), agatharesinol acetonide (8), and sugiresinol (9), were isolated from the branches and leaves of Sequoia sempervirens. Their structures were determined mainly by high-resolution mass spectroscopy (HR-MS), and various 1D- and 2D-NMR methods, as well as, in the case of 1, by means of X-ray diffraction. Compound 8 showed anticancer activity towards the A549 non-small-cell lung-cancer cell line (IC50 = 27.1 microM). The acetone extract of S. sempervirens was found to be antifungal towards Candida glabrata (IC50 = 15.98 microg/ml), and both the acetone and MeOH extracts inhibited the proteolytic activity of cathepsin B (IC50 = 4.58 and 5.49 microg/ml, resp.).
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, 650204 Kunming, Yunnan, People's Republic of China.
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Zhang
authors.forename: Ning-Hua
authors.initials: NH
authors.lastname: Tan
authors.forename: Ya-Bin
authors.initials: YB
authors.lastname: Yang
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.forename: Peng
authors.initials: P
authors.lastname: Cao
authors.forename: Yun-Shan
authors.initials: YS
authors.lastname: Wu
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D006801:Humans; D017705:Lignans / Q000737:chemistry* / Q000494:pharmacology; D008958:Models, Molecular; D015394:Molecular Structure; D032487:Sequoia / Q000737:chemistry*
chemical_list: D000935:Antifungal Agents; D000972:Antineoplastic Agents, Phytogenic; D017705:Lignans