Pregnane glycosides from Baseonema acuminatum

Two new pregnane glycosides, baseonemoside A and B, were isolated from the aerial parts of Baseonema acuminatum. Their structures were established as pregn-5-ene-3β,16α,20(S)-triol 3- O-β- d-cymaropyranosyl-(1→4)-β- d-digitoxopyranoside 20- O-β- d-glucopyranosyl-(1→2)-β- d-digitalopyranoside 1 and pregn-5-ene-3β,16α,20(S)-triol 3- O-β- d-cymaropyranosyl-(1→4)-β- d-cymaropyranosyl-(1→4)-β- d-digitoxopyranoside 20- O-β- d-glucopyranosyl-(1→2)-β- d-digitalopyranoside 2, respectively, on the basis of spectral evidence and chemical transformation.