STEROIDAL SAPONINS FROM THE SEEDS OF HYOSCYAMUS NIGER L.

Ten steroidal saponins have been isolated form the seeds of Hyoscyamus niger L. for the fi rst time and their structures have been elucidated. Seven saponins belong to spirostane series, two are furostane-type and one is pregnane glycoside. Hyoscyamosides B, C and C-2 are new steroidal saponins, which have never been reported before in literature. Complete assignments of the H-1 and C-13 NMR chemical shifts for all these glycosides were achieved by means of one-and two-dimensional NMR techniques, including III-III COSY, HSQC, HMBC and ROESY spectra.