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Two new flavone C-glycosides, chrysoeriol 6-C-β-D-glucopyranosyl-(1→3)-β-glucopyranoside (1) and apigenin 6-C-β-D-glucopyranosyl-(1→3)-β-glucopyranoside (2) were isolated from a methanolic extract of Isatis tinctoria leaves and identified on the basis of spectral analysis and hydrolysis.Two known flavone C-glycosides, isoscoparin (3) and isovitexin (4), were also identified.
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Hamburger et al. (2005) studied this question.
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