Abstract:

Two new triterpenoid saponins, monepaloside K (1) and monepaloside L (2), together with a known saponin, mazusaponin I (3), were isolated from the water_soluble part of the whole plant of Morina nepalensis var. alba Hand._Mazz. The structures of monepalosides K and L were determined to be 3_O_α_L_arabinopyranosyl_(1→3)_β_D_xylopyranosyl siaresinolic acid (1) and 3_O_β_D_glucopyranosyl_(1→3)_α_L_arabinopyranosyl siaresinolic acid 28_O_β_D_glucopyranosyl_(1→6)_β_D_glucopyranoside (2) respectively, on the basis of chemical and spectroscopic evidence.

Key words: Morina nepalensis var. alba, Dipsacaceae, monepaloside K, monepaloside L, mazusaponin I