Two new triterpenoid saponins from Rhaponticum uniflorum

Two new triterpenoid saponins were isolated from the roots of Rhaponticum uniflorum. Their structures were elucidated as 3-O-[β-d-glucopyranosyl]-ilexolic acid-28-O-[β-d-glucopyranosyl] ester 1 and 3-O-[β-d-glucopyranosyl]-urs-12, 19 (29)-dien-oic acid-28-O-[β-d-glucopyranosyl] ester 2 mainly by 1D, 2D NMR techniques and chemical methods.