Two New Triterpenoidal Saponins from Roots of Pachystela msolo

Abstract

Two new triterpenoidal saponins, pachystelanosides A (1) and B (2), and six known compounds have been isolated from the roots of Pachystela msolo. Their structures were elucidated on the basis of extensive 1D and 2D NMR studies (¹H, ¹³C, DEPT, COSY, TOCSY, NOESY, HSQC, HMBC), and ESI-MS as 3-O-(β-D-glucopyranosyl-(1→2)-β-D-apiofuranosyl-(1→6)-β-D-glucopyranosyl)-28-O-(β-D-xylopyranosyl-(1→4)[α-L-rhamnopyranosyl-(1→2)]-α-L-arabino-pyranosyl)-hydroxyprotobassic acid (1) and 3-O-(β-D-glucopyranosyl-(1→2)-β-D-apiofuranosyl-(1→6)-β-D-glucopyranosyl)-28-O-(β-D-xylopyranosyl-(1→4)[α-L-rhamnopyranosyl-(1→2)]-α-L-arabinopyranosyl)-7α-hydroxyprotobassic acid (2).