title: Cytotoxic biflavonoids from Selaginella delicatula.
abstract: Four new biflavonoids-robustaflavone 4'-methyl ether (1), robustaflavone 7,4'-dimethyl ether (2), 2",3" -dihydrorobustaflavone 7,4', -dimethyl ether (3), and 2",3" '-dihydrorobustaflavone 7,4', 7"-trimethyl ether (4)-as well as two known biflavonoids, robustaflavone and amentoflavone, and three caffeoylquinic acids, 3,5-di-O-caffeoylquinic acid, 3, 4-di-O-caffeoylquinic acid, and 4,5-di-O-caffeoylquinic acid, were isolated from Selaginella delicatula. The structures of the new compounds were established by spectroscopic analysis and chemical modification. The cytotoxic activity of these compounds on various tumor cell lines was evaluated, and both compounds 1 and 3 significantly suppressed the growth of Raji and Calu-1 tumor cell lines.
authors.affiliation: National Research Institute of Chinese Medicine, Pettou, Taipei 112, Taiwan, Republic of China. lclin@cma23.nricm.edu.tw
authors.forename: L C
authors.initials: LC
authors.lastname: Lin
authors.forename: Y C
authors.initials: YC
authors.lastname: Kuo
authors.forename: C J
authors.initials: CJ
authors.lastname: Chou
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002681:China; D004354:Drug Screening Assays, Antitumor; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet; D014407:Tumor Cells, Cultured
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D005419:Flavonoids