4', 5, 6, 7-Tetramethoxyflavone from the Leaves of Callicarpa japonica THUNB. and Its Variety luxurians REHD

Abstract

From the leaves of Callicarpa japonica THUNB. and C. japonica THUNB. var. luxurians REHD., 4', 5, 6, 7-tetramethoxyflavone (II) was isolated and it was found to have fish-killing activity. Its toxicity to Oryzias latipes TEMMINCK et SCHLEGEL was found to be one-half of that of 5, 6, 7-trimethoxyflavone (I).