title: Triterpenoid saponins from Madhuca butyracea.
abstract: Further investigation of the seeds of Madhuca butyracea yielded two new triterpenoid saponins, namely butyrosides C and D whose structures were established by means of chemical and spectral analyses as 3-O-beta-D-glucuronopyranosyl protobassic acid 28-O-alpha-L-rhamnopyranosyl(1-->3)-beta-D- xylopyranosyl(1-->4)-alpha-L-rhamnopyranosyl(1-->2)-alpha-L-arabinopy ranoside and 3-O-beta-D-glucuronopyranosyl 16 alpha-hydroxy protobassic acid 28-O-beta-D-apiofuranosyl(1-->3)-beta-D-xylopyranosyl(1-->4)-alpha -L- rhamnopyranosyl(1-->2)-alpha-L-arabinopyranoside, respectively.
authors.affiliation: Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of Sciences, China.
authors.forename: X C
authors.initials: XC
authors.lastname: Li
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Liu
authors.forename: D Z
authors.initials: DZ
authors.lastname: Wang
authors.forename: C R
authors.initials: CR
authors.lastname: Yang
authors.forename: S K
authors.initials: SK
authors.lastname: Nigam
authors.forename: G
authors.initials: G
authors.lastname: Misra
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010944:Plants / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D014315:Triterpenes; C091398:butyroside C; C091399:butyroside D