Studies on the Medicinal Resources. XXII

Long white needles, m. p. 215° (decomp.), were obtained in 0.07% yield from the fresh leaves of Salix bakko KIMURA. This substance corresponds to the molecular formula of C27H30O15⋅2H2O, and colors greenish brown to ferric chloride, faint pink to orange with magnesium and hydrochloric acid, and faint pink with zinc and hydrochloric acid.Its hydrolysis with 35% hydrochloric acid produced one mole each of chrysoeriol, glucose, and arabinose.The position of sugar bonding was proved to be 7, since complete methylation of the glycoside with diazomethane and subsequent hydrolysis afforded luteolin 3′, 4′, 5-trimethyl ether, m. p. 281-282°. This glycoside is therefore chrysoeriol 7-glucoparabinoside and was named bakkoside.