title: Antioxidative 7-oxodehydropodocarpane-type trinorditerpenes from the bark of Taiwania cryptomerioides.
abstract: Five new 7-oxopodocarpane-type trinorditerpenes together with 1beta,13,14-trihydroxy-8,11,13-podocarpatrien-7-one ( 1) were isolated from the bark of Taiwania cryptomerioides. By using NMR and other spectral methods, the structures of five new compounds, 14-hydroxy-13-methoxy-8,11,13-podocarpatriene-3,7-dione ( 2), 1beta,14-dihydroxy-13-methoxy-8,11,13-podocarpatrien-7-one ( 3), 13,14-dihydroxy-8,11,13-podocarpatriene-3,7-dione ( 4), 3beta,13,14-trihydroxy-8,11,13-podocarpatrien-7-one ( 5), and 1beta,13,14-trihydroxy-8,11,13-podocarpatriene-2,7-dione ( 6), were elucidated. Compounds 1, 4, 5, and 6 exhibited strong antioxidative activity.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei, Taiwan, Republic of China. yhkuo@ccms.ntu.edu.tw
authors.forename: Yueh-Hsiung
authors.initials: YH
authors.lastname: Kuo
authors.forename: Shih-Chang
authors.initials: SC
authors.lastname: Chien
authors.forename: Ching-Chuan
authors.initials: CC
authors.lastname: Kuo
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D001713:Biphenyl Compounds; D029779:Cupressaceae; D004224:Diterpenes / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D020128:Inhibitory Concentration 50; D009682:Magnetic Resonance Spectroscopy; D008517:Phytotherapy; D010851:Picrates; D024301:Plant Bark; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D004224:Diterpenes; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl