title: A new naphthoquinone from Sinningia leucotricha (Gesneriaceae).
abstract: A new naphthoquinone, 7,8-dimethoxydunnione (1), was isolated from Sinningia leucotricha (Hoehne) Moore tubers, together with four known compounds: 7- hydroxy-t-dunnione (2), 6-methoxy-7-hydroxy-a-dunnione (3), presilphiperfolan-9-ol (4), and betulinic acid (5). All compounds were identified by spectroscopic and mass spectrometric techniques and comparison with literature data. Compounds 2-5 are being reported for the first time in S. leucotricha.
authors.forename: Maria Helena
authors.initials: MH
authors.lastname: Verdan
authors.forename: Hector H F
authors.initials: HH
authors.lastname: Koolen
authors.forename: Marcos José
authors.initials: MJ
authors.lastname: Salvador
authors.forename: Andersson
authors.initials: A
authors.lastname: Barison
authors.forename: Maria Elida A
authors.initials: ME
authors.lastname: Stefanello
mesh_terms: D019684:Magnoliopsida / Q000737:chemistry*; D015394:Molecular Structure; D009285:Naphthoquinones / Q000737:chemistry*; D035281:Plant Tubers / Q000737:chemistry
chemical_list: C000598637:7,8-dimethoxydunnione; D009285:Naphthoquinones