title: Cytotoxic labdane alkaloids from an ascidian Lissoclinum sp.: isolation, structure elucidation, and structure-activity relationship.
abstract: Four labdane alkaloids, haterumaimides N-Q (1-4), were isolated from an ascidian Lissoclinum sp. and their structures were elucidated by chemical and spectral analyses. Investigation of the structure-activity relationships of haterumaimides J-K, N-Q, and 14 related compounds suggested that the presence of hydroxyl groups at C-6, C-7, C-12, and C-18, a chlorine atom at C-2, and an imido NH in ring C should be essential for cytotoxicity against P388 cells.
authors.affiliation: Department of Chemistry, Biology and Marine Sciences, University of the Ryukyus, Nishihara-cho, Okinawa 903-0213, Japan.
authors.forename: Jasim
authors.initials: J
authors.lastname: Uddin
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Ueda
authors.forename: Eric R O
authors.initials: ER
authors.lastname: Siwu
authors.forename: Masaki
authors.initials: M
authors.lastname: Kita
authors.forename: Daisuke
authors.initials: D
authors.lastname: Uemura
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008968:Molecular Conformation; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D014561:Urochordata / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; C514914:haterumaimide N; C514918:haterumaimide O; C514917:haterumaimide P; C514915:haterumaimide Q