In the 1H NMR spectra, the sugar moiety signals of 6-10
were somewhat different from those of 1-5 because of the
cis double bond and the influence of the aromatic ring.
Biological assays of 1-10 included cytotoxity against
human cancer cell lines KB, Hela, and A549 in vitro,
21 as
well as antifungal effects against four yeasts22 and four
filamentous fungi.23 Only 2 showed moderate cytotoxity
against A549 (IC50 ) 80 µg/mL). Compounds 1-10 showed
no antifungal activity. In comparison with the reported
antifungal activity of resveratrol,6 it can be inferred that
the free 3-hydroxyl is essential for antifungal activity