Abstract
One of the components in Timo, Anemarrhenae Rhizoma, was known to be flavonoid compound, C22H18O11⋅2H2O, m.p. 257-258° by Nakaoki and coworkers. While Shimada and coworkers reported later that it would be a xanthon derivative, C19H18O11 and perhaps mangiferin or something concerned with it, but it had not been exactly recognized since now. It was identified to be mangiferin by the authors using UV, IR, X-ray analysis etc.
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