Phytochemical Studies of Seeds of Medicinal Plants. II. A New Dihydroflavonol Glycoside and a New 3-Methyl-1-butanol Glycoside from Seeds of Platycodon grandiflorum A. DE CANDOLLE.

Two new glycosides, termed as flavoplatycoside (1) and grandoside (2), respectively, have been isolated from the seeds of Platycodon grandiflorum A. DE CANDOLLE (Campanulaceae) and their structures have been established as (2R, 3R)-taxifolin 7-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside and 3-methyl-1-butanol 1-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside, respectively, based on chemical and spectral evidence. Four known flavonoids, (2R, 3R)-taxifolin (3), quercetin 7-O-glucoside (4), luteolin-7-O-glucoside (5), and quercetin 7-O-rutinoside (6), were also isolated.