title: Sesquiterpenes from Laurencia similis.
abstract: One new sesquiterpene, (4E)-1-bromo-5-[(1'S*,3'R*)-3'-bromo-2',2'-dimethyl-6'-methylenecyclohexyl]-3-methylpent-4-ene-2,3-diol (1), and fifteen known sesquiterpenes, isopalisol (2), luzonensol (3), palisadin B (4), aplysistatin (5), palisadin A (6), 4-hydroxyl-palisudin C (7), 5-acetoxypalisadin B (8), 10-hydroxyaristolan-9-one (9), aristol-8-en-1-one (10), aristolan-9-en-1-one (11), aristolan-1(10)-en-9-one (12), aristolan-1(10)-en-9-ol (13), aristolan-1(10),8-diene (14), aristolan-1,9-diene (15) and aristofone (16), were isolated from a sample of marine red alga Laurencia similis. Their structures were established by detailed NMR spectroscopic analysis and comparison with literature data. Compounds 2-9, and 16 were isolated for the first time from this species. All these metabolites were submitted for a cytotoxicity assay against the tumor cell line BEL7402 (human liver adenocarcinoma), but all of them were found inactive (IC(50 )> 10 microg/mL).
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. qdshua@sina.com
authors.forename: Hua
authors.initials: H
authors.lastname: Su
authors.forename: Da-Yong
authors.initials: DY
authors.lastname: Shi
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Shu-Ju
authors.initials: SJ
authors.lastname: Guo
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Li
authors.forename: Zhao-Hui
authors.initials: ZH
authors.lastname: Yuan
authors.forename: Xiao-Bin
authors.initials: XB
authors.lastname: Zhu
mesh_terms: D045744:Cell Line, Tumor; D002681:China; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D044722:Laurencia / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D012717:Sesquiterpenes / Q000737:chemistry*
chemical_list: D012717:Sesquiterpenes