G. Boudourovakrasteva et al., PHENOLICS FROM BRAZILIAN PROPOLIS, Zeitschrift fur Naturforschung. C, A journal of biosciences, 52(9-10), 1997, pp. 676-679
The main phenolic constituents from Brazilian propolis, originating fr
om Sao Paulo State, were isolated and identified: three flavonoids, a
prenylated coumaric acid and two new benzopyranes, E and Z imethyl-6-c
arboxyethenyl-8-prenyl-2H-benzopyranes.