STUDIES ON THE CONSTITUENTS OF BRAZILIAN PROPOLIS

Two new cinnamic acid derivatives along with twenty two known compound s, including five flavoniods, three phenolic compounds, six caffeoylqu inic acids and eight cinnamic acid derivatives, were isolated from Bra zilian propolis. New compounds were elucidated as -hydroxy-8-prenyl-H- 1-benzopyran-6-yl)-2-propenoic acid and -methylethyl)7-prenyl-benzofur an-5-yl]-2-propenoic acid, on the basis of spectral evidence. Three co mpounds; dihydrokaempferide, (+)-threo-1-C-guaiacylglycerol and 3-pren yl 4-(2-methylpropionyloxy)cinnamic acid were isolated from propolis a t the first time.