A New Triterpene Glycoside from the Stems of Akebia quinata

A new triterpene glycoside, named akeqintoside E, 3 αα,23αα-dihydroxy-30-norolean-12,20(29)-dien-28-oic acid 28-O-αα-L-rhamnopyranosyl-(1→4)-O-ββ-D-glucopyranosyl-(1→6)-O-ββ-D-glucopyranosyl ester (1), along with seven known compounds, akeboside St_h (2), begoniifolide A (3), akebia saponin P_J2 (4), 3ββ-[(O-GlcUA-(1–3)-O-[Rha-(1–2)]-Ara)oxy]olean-12-en-28-oic acid O-Rha-(1–4)-Glc-(1–6)-Glc ester (5), kalopanax saponin D (6), 3ββ-[(O-GlcUA-(1–3)-Ara)oxy]olean-12-en-28-oic acid O-Rha-(1–4)-Glc-(1–6)-Glc ester (7), and akebia saponin P_J3 (8), was isolated from Akebia quinata. The structures of the compounds were identified on the basis of 1D and 2D NMR, including ¹H– ¹H COSY, HSQC, HMBC, and NOESY spectroscopic analyses.