title: Two new diterpenoids from Plectranthus nummularius Briq.
abstract: Two new antioxidative diterpenoids, plectranthol A (3)[19-O-(3,4-dihydroxybenzoyl)-11,12-dihydroxy-20(10-->5)-abeo-abieta-1(10),6,8,11,13-tetraene] and plectranthol B (4)[12-O-(3-methyl-2-butenoyl)-19-O-(3,4-dihydroxybenzoyl)-11-hydroxyabieta-8,11,13-trienel along with two known diterpenoids, parvifloron E (1) and F (2) were isolated from the leaves of Plectranthus nummularius Briq. Antioxidative activities of the compounds were measured by the alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH) method.
authors.affiliation: Kyoritsu College of Pharmacy, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Narukawa
authors.forename: N
authors.initials: N
authors.lastname: Shimizu
authors.forename: K
authors.initials: K
authors.lastname: Shimotohno
authors.forename: T
authors.initials: T
authors.lastname: Takeda
mesh_terms: D045784:Abietanes; D000975:Antioxidants / Q000737:chemistry*; D015764:Bepridil / Q000031:analogs & derivatives* / Q000737:chemistry; D001713:Biphenyl Compounds; D004224:Diterpenes / Q000138:chemical synthesis* / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D016166:Free Radical Scavengers / Q000737:chemistry; D005609:Free Radicals / Q000737:chemistry; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010851:Picrates; D018515:Plant Leaves / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D045784:Abietanes; D000975:Antioxidants; D001713:Biphenyl Compounds; D004224:Diterpenes; D016166:Free Radical Scavengers; D005609:Free Radicals; D010851:Picrates; C446966:plectranthol A; C446967:plectranthol B; D015764:Bepridil; C004931:1,1-diphenyl-2-picrylhydrazyl