New triterpenoid sapoin from Ardisia gigantifolia Stapf.

One new triterpenoid sapoin with two known triterpenoid sapoins: 3β-O-{α-l-rhamnopyranosyl-(1 → 3)-[β-d-xylopyranose-(1 → 2)]-β-d-glucopyranosyl-(1 → 4)-α-l-arabinopyranosyl}-3β-hydroxy-13β,28-epoxy-oleanan-16-oxo-30-al (1), 3β-O-{α-l-rhamnopyranosyl-(1 → 3)-[(β-d-xylopyranosyl-(1 → 2)]-β-d-galactopyranosyl-(1 → 4)-[(β-d-glucopyranosyl-(1 → 2)]-α-l-arabinopyranoside}-16α-hydroxy-13,28-epoxy-oleanane (2) and cyclamiretin A 3β-O-α-l-rhamnopyranosyl-(1 → 3)-[β-d-xylopyranosyl-(1 → 2)]-β-d-glucopyranosyl-(1 → 4)-[β-d-glucopyranosyl-(1 → 2)]-α-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.