The isolated compounds 1, 2, and 3 (mixture of diastereomers)
were tested for their cytotoxic activity against the
HL-60, HeLa-S3, and MCF-7 cancer cell lines. All compounds
gave IC50 values of >20 μMfor all cell lines, with the exception of
compound 3 in the HL-60 cell line (IC50 13.7 μM). Compound 3
provided an IC50 value of >20 μM for the HEK-293 mammalian
noncancerous cell line, thus suggesting a significant selectivity
toward the HL-60 cell line. However, the difference in activity
between the two cell lines could reside in a general stronger effect
of the compound in suspension than in adherent cultures.