Fractionation of an ethanolic extract of Swartzia polyphylla, guided i
n part by an assay for inhibition of protein kinase C, led to the isol
ation of the known flavonoids biochanin A, dihydrobiochanin A, ferreir
in, dalbergioidin, and naringenin, and one new prenylated isoflavanone
, dihydrolicoisoflavone [1].