Components of Broussonetia kazinoki Sieb. I Structures of two new isoprenylated flavans and five new isoprenylated 1,3-diphenylpropane derivatives.

Two new isoprenylated flavans, kazinols E and H, and five new isoprenylated 1, 3-diphenyl-propane derivatives, kazinols C, D, F, G, and K, were isolated from the extract of the root bark of Broussonetia kazinoki SIEB. (Japanese name, Kimekozo, Moraceae). On the basis of chemical and spectral evidence, the structures of kazinols E and H were shown to be 3 and 6, respectively, and the structures of kazinols C, D, F, G, and K to be 1, 2, 4, 5, and 7, respectively.