title: Chalcone-flavone tetramer and biflavones from Aristolochia ridicula.
abstract: Biflavones and a chalcone-flavone tetramer were isolated from the leaves of Aristolochia ridicula, together with proto-quercitol. Their structures were determined by spectroscopic methods.
authors.affiliation: Instituto de Química, Universidade Estadual Paulista, Campus de Araraquara, UNESP, C.P. 355, 14801-970 Araraquara, São Paulo, Brazil.
authors.forename: Marcos B
authors.initials: MB
authors.lastname: Machado
authors.forename: Lucia M X
authors.initials: LM
authors.lastname: Lopes
mesh_terms: D030022:Aristolochia / Q000737:chemistry*; D002599:Chalcone / Q000031:analogs & derivatives* / Q000302:isolation & purification*; D047188:Chalcones; D047309:Flavones / Q000302:isolation & purification*; D007294:Inositol / Q000031:analogs & derivatives* / Q000302:isolation & purification; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D047188:Chalcones; D047309:Flavones; C483225:proto-quercitol; C501193:ridiculuflavone A; C501194:ridiculuflavone B; C501192:ridiculuflavonylchalcone A; D007294:Inositol; D002599:Chalcone