title: 1H and 13C NMR spectral data of new saponins from Cordia piauhiensis.
abstract: Two new bidesmoside triterpenoid saponins were isolated from stems of Cordia piauhiensis. Their structures, characterized as 3-O-alpha-L-rhamnopyranosyl-(1 --> 2)-beta-D-glucopyranosyl pomolic acid 28-O-beta-D-glucopyranosyl ester (1) and 3-O-alpha-L-rhamnopyranosyl-(1 --> 2)-beta-D-glucopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranosyl ester (2), were unequivocally established after extensive NMR (1H, 13C, DEPT 135 degrees, COSY, HSQC, HMBC, TOCSY, and NOESY) studies.
authors.affiliation: Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, CP 12.200, 60021-970, Fortaleza-CE, Brazil.
authors.forename: Renata P
authors.initials: RP
authors.lastname: Santos
authors.forename: Edilberto R
authors.initials: ER
authors.lastname: Silveira
authors.forename: Daniel Esdras de A
authors.initials: DE
authors.lastname: Uchôa
authors.forename: Otília Deusdênia L
authors.initials: OD
authors.lastname: Pessoa
authors.forename: Francisco Arnaldo
authors.initials: FA
authors.lastname: Viana
authors.forename: Raimundo
authors.initials: R
authors.lastname: Braz-Filho
mesh_terms: D002247:Carbon Isotopes; D031213:Cordia / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D002247:Carbon Isotopes; D012503:Saponins