title: [The structures of yemuoside YM10 and YM12 from Stauntonia chinensis].
abstract: Two new nortriterpenoid saponins, named yemuoside YM10 (I) and YM12 (II), were isolated from Stauntonia chinensis Decne. A new prosaponin (VI) was isolated from the cleavage of ester-glycoside linkage. Their chemical structures were elucidated by means of chemical and spectrometric analysis. Yemuoside YM10 (I): C58H92O25, a white powder, mp 215-219 degrees C (dec), [alpha]D20-4.41 degrees (c 0.272, CH3OH). Its structure was found to be 28-O-alpha-L-rhamnopyranosyl- (1----4) -beta-D-glucopyranosyl- (1----6) -beta-D-glucopyranosyl ester of 3-O-alpha-L-rhamnopyranosyl-(1----2)-alpha-L-arabinopyranosyl-30-+ ++norolean-12, 20 (29) -dien-28-oic acid. Yemuoside YM12 (II): C52H82O21, a white powder, mp 200-204 degrees C (dec.), [alpha]D20 + 10.12 degrees (c 0.346, CH3OH). Its structure was found to be 28-O-beta-D-glucopyranosyl- (1----6) -beta-D-glucopyranosyl ester of 3-O-alpha-L-rhamnopyranosyl- (1----2) -alpha-L-arabinopyranosyl-30-norolean-12, 20 (29)-dien-28-oic acid. Prosaponin (VI): C40H62O11, a white powder, mp 243-246 degrees C (dec.), [alpha]D22 + 12.13 degrees (c 0.128, CH3OH). Its structure was found to be 3-O-alpha-L-rhamnopyranosyl- (1----2)-alpha-L-arabinopyranosyl-30-norolean-12, 20 (29)-dien-28-oic acid.
authors.forename: H B
authors.initials: HB
authors.lastname: Wang
authors.forename: D Q
authors.initials: DQ
authors.lastname: Yu
authors.forename: X T
authors.initials: XT
authors.lastname: Liang
authors.forename: N
authors.initials: N
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Tamai
authors.forename: S
authors.initials: S
authors.lastname: Omura
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D012503:Saponins / Q000302:isolation & purification*; D014315:Triterpenes
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D014315:Triterpenes; C062410:yemuoside YM(10); C062411:yemuoside YM(12)