the new compound
2 was also found to be strongly active against DLD-1
(IC50: 2lM) with a cytotoxicity higher than etoposide (IC50:
4 lM). Unfortunately, cytotoxicities of the aglycone of glycosides
1, 2, 6 and 8 were not assessed because isolated quantities were
not sufficient. The presence of a hydroxyl group on the carbon 21
of compound 6 increased significantly (about 40-fold) the cytotoxicity
against DLD-1 cells in comparison with compound 8.