Bioassay-directed fractionation of an ethanolic extract of Selaginella
moellendorffii has led to the isolation of a known biflavone, ginkget
in (1). A dose-dependent inhibition was observed with 1 on the growth
of OVCAR-3 (human ovarian adenocarcinoma) cells with 50% inhibition oc
curring at 1.8 mu g/mL. Nonbioactive fractions yielded four additional
known biflavones, amentoflavone 7,4',7'',4'''-tetramethyl ether, kaya
flavone, podocarpusflavone A, and amentoflavone.