title: Three naphthalenes from root bark of Hibiscus syriacus.
abstract: Three new naphthalenes, designated as syriacusins A-C, were isolated from the root bark of Hibiscus syriacus. These compounds were identified as 2,7-dihydroxy-6-methyl-8-methoxy-1-naphthalenecarbaldehyde, 2-hydroxy-6-hydroxymethyl-7,8-dimethoxy-1-naphthalenecarbaldehyde, 1-carboxy-2,8-dihydroxy-6-methyl-7-methoxynaphthalenecarbolactone (1-->8), respectively, on the basis of various spectral studies. The compounds inhibited lipid peroxidation with IC50s of 0.54, 5.90 and 1.02 micrograms ml-1, respectively. The first compound also showed cytotoxicity against some human cancer cell lines with an ED50 of 1.5-2.4 micrograms ml-1.
authors.affiliation: Korea Research Institute of Bioscience and Biotechnology, KIST, Yusong, Taejon, Korea.
authors.forename: I D
authors.initials: ID
authors.lastname: Yoo
authors.forename: B S
authors.initials: BS
authors.lastname: Yun
authors.forename: I K
authors.initials: IK
authors.lastname: Lee
authors.forename: I J
authors.initials: IJ
authors.lastname: Ryoo
authors.forename: D H
authors.initials: DH
authors.lastname: Choung
authors.forename: K H
authors.initials: KH
authors.lastname: Han
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D006801:Humans; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D009281:Naphthalenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D051381:Rats; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D000975:Antioxidants; D009281:Naphthalenes; D010936:Plant Extracts