title: Antitumor agents. Part 212. Bucidarasins A-C, three new cytotoxic clerodane diterpenes from Bucida buceras.
abstract: As part of a study on antitumor agents from rainforest plants, four new clerodane diterpenes, bucidarasins A--D (1-4), were isolated from Bucida buceras. Their structures were elucidated from detailed 2D NMR analyses. Compounds 1-3 showed potent cytotoxicity against human tumor cell lines with IC(50) values of 0.5-1.9 microM. The potency was retained in drug resistant lines.
authors.affiliation: Natural Products Laboratory, School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, USA.
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Hayashi
authors.forename: Yuka
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Kenneth F
authors.initials: KF
authors.lastname: Bastow
authors.forename: Gordon
authors.initials: G
authors.lastname: Cragg
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nozaki
authors.forename: Kuo-Hsiung
authors.initials: KH
authors.lastname: Lee
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D004224:Diterpenes / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology*; D045785:Diterpenes, Clerodane; D019008:Drug Resistance, Neoplasm; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D014407:Tumor Cells, Cultured
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D045785:Diterpenes, Clerodane; D010936:Plant Extracts; C456402:bucidarasin A; C456403:bucidarasin B; C456404:bucidarasin C