Steroidal and triterpenoidal saponins from the stem bark extract of Stachytarpheta angustifolia Mill (Vahl) Verbenaceae

Two saponins were isolated from the stem bark extract of Stachytarpheta angustifolia. Their structures were established by spectroscopic and chemical analysis as (23S, 25S) - 5α - spirostan – 24 – one - 3β, 23 – diol – 3 – O – {α – L – rhamnopyranosyl – (1→2) – [O – β - D - glucopyranosyl – (1→4)] – β - D – galactopyranoside} (1) and 3β – O –( β- D - Xylopyranosyl – (1-3) – α – L – arabinopyranosyl) - 20β, 23-dihydroxy urs – 12 – en – 28 – O – [- α – L – rhamnopyranosyl – (1-3) – α – L – rhamnopyranosyl – (1-6) – β - D - glucopyranosyl -] ester.