New triterpenoid sapoin from Ardisia gigantifolia Stapf

One new triterpenoid sapoin with two known triterpenoid sapoins: 3b-O-{a-L-Rhamnopyranosyl-(1→3)-b-D- xylopyranose-(1→2)]-b-D-glucopyranosyl-(1→4)-a-L-arabinopyranosyl}-3b-hydroxy-13b,28-epoxy-oleanan-16-oxo-30-al (1), 3b-O-{a-L-rhamnopyranosyl-(1→3)-(b-D-xylopyranosyl-(1→2)]-b-D-galactopyranosyl-(1→4)-(b-D-glucopyranosyl- (1→2)]-a-L-arabinopyranoside}-16a-hydroxy-13,28-epoxy-oleanane (2) and cyclamiretin A 3b-O-a-L-rhamnopyranosyl- (1→3)-b-D-xylopyranosyl-(1→2)]-b-D-glucopyranosyl-(1→4)-b-D-glucopyranosyl-(1→2)]-a-L-arabinopyranoside (3) were isolated from Ardisia gigantifolia Stapf. Their structures were elucidated by means of 1H and 13C NMR spectroscopic studies, including 2D-NMR technique.