title: Benzoquinones, a homoisoflavanone and other constitutents from Polygonatum alte-lobatum.
abstract: From the rhizomes of Polygonatum alte-lobatum, two new homologous series of 1,4-benzoquinones, polygonaquinones A and B, a novel homoisoflavanone, a new gentrogenin glycoside and 13 known compounds were isolated and characterized. The structures of the new compounds were determined as two homologous series of three 2,5-dihydroxy-3-methyl-6-alkyl-1,4-benzoquinones and three 2-hydroxy-3-methyl-6-alkyl-1,4-benzoquinones, with chain lengths C21 to C23, and 4',5,7-trihydroxy-6,8-dimethylhomoisoflavanone and gentrogenin 3-O-beta-D-glucopyranosyl(1-->2)-[beta-D-xylopyranosyl(1-->3)] -beta-D-glucopyranosyl(1-->4)-beta-D-galactopyranoside.
authors.affiliation: School of Pharmacy, Kaohsiung Medical College, Taiwan, R.O.C.
authors.forename: P L
authors.initials: PL
authors.lastname: Huang
authors.forename: K H
authors.initials: KH
authors.lastname: Gan
authors.forename: R R
authors.initials: RR
authors.lastname: Wu
authors.forename: C N
authors.initials: CN
authors.lastname: Lin
mesh_terms: D016227:Benzoquinones / Q000737:chemistry / Q000302:isolation & purification*; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010946:Plants, Medicinal / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D016227:Benzoquinones; C105183:polygonaquinone A; C105184:polygonaquinone B