title: Two new steroidal saponins from the seeds of Allium cepa L.
abstract: Two new steroidal saponins, ceparosides C (1) and D (2), have been isolated from the seeds of Allium cepa L. Their structures have been established as 26-O-(beta-D-glucopyranosyl)-(25R)-furost-5,20(22)-dien-3beta,26-diol-3-O-beta-D-glucopyranosyl-(1 --> 4)-[alpha-l-rhamnopyranosyl (1 --> 2)]-beta-D-galactopyranoside (1) and 26-O-(beta-D-glucopyranosyl)-(25S)-furost-5,20(22)-dien-3beta, 26-diol-3-O-beta-D-glucopyranosyl-(1 --> 4)-[alpha-L-rhamnopyranosyl(1 --> 2)]-beta-D-galactopyranoside (2) by means of spectral and chemical methods.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Yuan
authors.forename: Teng-Fei
authors.initials: TF
authors.lastname: Ji
authors.forename: Chuang-Jun
authors.initials: CJ
authors.lastname: Li
authors.forename: Ai-Guo
authors.initials: AG
authors.lastname: Wang
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Yang
authors.forename: Ya-Lun
authors.initials: YL
authors.lastname: Su
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D019697:Onions / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D012639:Seeds / Q000737:chemistry; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D013256:Steroids; C540728:ceparoside C; C540729:ceparoside D