title: New cytotoxic butanolides from Lindera obtusiloba BLUME.
abstract: Three new butanolides, 2-(1-methoxy-11-dodecenyl)-penta-2,4-dien-4-olide (1), (2Z,3S,4S)-2-(11-dodecenylidene)-3-hydroxy-4-methylbutano lide (2) and (2E,3R,4R)-2-(11-dodecenylidene)-3-hydroxy-4-methoxy-4-methylbu tanolide (3), were isolated from the stems of Lindera obtusiloba BLUME. Their chemical structures were assigned by spectroscopic evidence. They exhibited cytotoxicity against cultured human tumor cell lines with their ED50 values ranging from 3.19 to 14.63 microg/ml.
authors.affiliation: Natural Products Laboratory, College of Pharmacy, Sungkyunkwan University, Suwon, Korea.
authors.forename: H C
authors.initials: HC
authors.lastname: Kwon
authors.forename: N I
authors.initials: NI
authors.lastname: Baek
authors.forename: S U
authors.initials: SU
authors.lastname: Choi
authors.forename: K R
authors.initials: KR
authors.lastname: Lee
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014407:Tumor Cells, Cultured
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D015107:4-Butyrolactone