A new C21 steroidal glycoside from Cynanchum inamoenum (Maxim) Loes
A new C21 steroidal glycoside, 5,6-epoxy-glaucogenin C-3-O--d-glucopyranosyl-(14)--d-glucopyranosyl-(14)--d-cymaropyranosyl-(14)--d-oleandropyranosyl-(14)--d-oleandropyranoside, named inamoside D (1), was isolated from the MeOH extract of the roots of Cynanchum inamoenum (Maxim.) Loes (Asclepiadaceae). In addition, five known compounds, including 7-demethoxytylophorine (2), dehydrodiconiferyl alcohol '-O--d-glucopyranoside (3), -d-fructofuranosyl-(21)--d-(6-O-sinapoyl)-glucopyranoside (4), neohancoside C (5), and cuchiloside (6), have also been isolated. The structure of 1 was determined by 1D- and 2D-NMR spectroscopies. All the compounds were isolated from this plant for the first time.