title: Cytotoxic diterpenoids from the soft coral Sarcophyton crassocaule.
abstract: Five new cembrane diterpenoids, sarcrassins A-E (1-5) along with a known compound, emblide (6), have been isolated from the soft coral Sarcophyton crassocaule collected from the Bay of Sanya, Hainan Island, China. The structures of 1-5 were determined by spectroscopic methods including 1D and 2D NMR techniques. Their relative configurations were determined by NMR data and NOESY experiments. Compounds 2, 4, and 6 exhibited significant cytotoxic activities against KB cell lines with IC50 values of 5.0, 4.0, and 5.0 microg/mL, respectively, while compounds 1 and 5 showed moderate cytotoxicity toward KB cell lines with IC50 values of 19.0 and 13.0 microg/mL, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.
authors.forename: Cuixian
authors.initials: C
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Jingyu
authors.initials: J
authors.lastname: Su
authors.forename: Yongju
authors.initials: Y
authors.lastname: Liang
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Yang
authors.forename: Kangcheng
authors.initials: K
authors.lastname: Zheng
authors.forename: Longmei
authors.initials: L
authors.lastname: Zeng
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D020128:Inhibitory Concentration 50; D007624:KB Cells; D015394:Molecular Structure; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004224:Diterpenes