title: Cytotoxic germacranolide sesquiterpene lactones from Carpesium triste var. manshuricum.
abstract: Four known germacranolide sesquiterpene lactones, 2alpha,5-epoxy-5,10-dihydroxy-6alpha-angeloyloxy-9beta-isobutyloxy-germacran-8alpha,12-olide (1), 2alpha,5-epoxy-5,10-dihydroxy-6alpha,9beta-diangeloyloxy-germacran-8alpha,12-olide (2, divaricin B), 2alpha,5-epoxy-5,10-dihydroxy-6alpha-angeloyloxy-9beta-(2-methylbutyloxy)-germacran-8alpha,12-olide (3) and 2alpha,5-epoxy-5,10-dihydroxy-6alpha-angeloyloxy-9beta-(3-methylbutyloxy)-germacran-8alpha,12-olide (4), were isolated from the chloroform-soluble fraction of the whole plants of Carpesium triste var. manshuricum. Their chemical structures were determined using spectroscopic methods, including 2D-NMR. All the isolates showed significant cytotoxicities (ED50 value: 4.3-16.8 microM) against five human tumor cell lines; A549, SK-OV-3, SK-MEL-2, XF498 and HCT15.
authors.affiliation: College of Pharmacy, CBITRC, Chungbuk National University, Cheongju 361-763, Korea.
authors.forename: Mi-Ran
authors.initials: MR
authors.lastname: Kim
authors.forename: Bang Yeon
authors.initials: BY
authors.lastname: Hwang
authors.forename: Eun-Sook
authors.initials: ES
authors.lastname: Jeong
authors.forename: Yong-Moon
authors.initials: YM
authors.lastname: Lee
authors.forename: Hwan-Soo
authors.initials: HS
authors.lastname: Yoo
authors.forename: Youn-Bok
authors.initials: YB
authors.lastname: Chung
authors.forename: Jin Tae
authors.initials: JT
authors.lastname: Hong
authors.forename: Dong-Cheul
authors.initials: DC
authors.lastname: Moon
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D019659:Asteraceae / Q000737:chemistry*; D045744:Cell Line, Tumor; D006801:Humans; D007783:Lactones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D045788:Sesquiterpenes, Germacrane / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D007783:Lactones; D045788:Sesquiterpenes, Germacrane; C432449:germacranolide