title: Two new steroidal saponins from dried fermented residues of leaf-juices of Agave sisalana forma Dong No. 1.
abstract: In a previous paper, we reported the isolation and structure determination of three new steroidal saponins, dongnosides C (3), D (2) and E (1) from the dried fermented residues of leaf-juices of Agave sisalana forma Dong No. 1. In a continuing study on this plant, two additional new major steroidal saponins, named dongnosides B (4) and A (5), were obtained. Their structures were characterized respectively as tigogenin 3-O-alpha-L-rhamonpyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->2)- [beta-D- glucopyranosyl-(1-->3)]-beta-D-glucopyranosyl-(1-->4)-beta-D-galactop yranoside and 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->2)-[beta- D- xylopyranosyl-(1-->3)-beta-D-glucopyranosyl-(1-->3)]-beta-D- glucopyranosyl-(1-->4)-beta-D-galactopyranoside on the basis of chemical and physicochemical evidence.
authors: Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing.
authors: Y
authors: Y
authors: Ding
authors: R H
authors: RH
authors: Tian
authors: C R
authors: CR
authors: Yang
authors: Y Y
authors: YY
authors: Chen
authors: T
authors: T
authors: Nohara
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010936:Plant Extracts / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013150:Spirostans
chemical_list: D010936:Plant Extracts; D012503:Saponins; D013150:Spirostans; C080918:dongnoside B; C080915:dongnoside A