Triterpenoid saponins from Stauntonia chinensis

A new triterpenoid saponin, named stauntoside A (1) along with four known saponins (2,3,4,5) was isolated from Stauntonia chinensis DC., (Lardizabalaceae). Their structures were elucidated by spectroscopic analysis and chemical methods as 3-O-α-l-arabinopyranosyl-30-norhederagenin -28-O-β-d-glucopyranosyl-(1 → 6)-β-d-glucopyranosyl ester (1), 3-O-α-l-arabinopyranosyl-30- norhederagenin-28-O-α-l-rhamnopyranosyl-(1 → 4)-β-d-glucopyranosyl-(1 → 6)-β-d-glucopyranosyl ester (2), 3-O-α-l-rhamnopyranosyl-(1 → 2)-α-l-arabinopyranosyl-30-norhederagenin-28-O-α-l- rhamnopyranosyl-(1 → 4)-β-d-glucopyranosyl-(1 → 6)-β-d-glucopyranosyl ester (3), 3-O-α-l- arabinopyranosyl-hederagenin-28-O-α-l-rhamnopyranosyl-(1 → 4)-β-d-glucopyranosyl-(1 → 6)-β-d- glucopyranosyl ester (4), 3-O-α-l-rhamnopyranosyl-(1 → 2)-α-l-arabinopyranosyl-hederagenin -28-O-α-l-rhamnopyranosyl-(1 → 4)-β-d-glucopyranosyl-(1 → 6)-β-d-glucopyranosyl ester (5). The 1H and 13C NMR data for Glycoside L-G1 or Sinofoside A are paradox in the reported before....