| Abstrakt: |
From the herbLedum palustre L., collected in July in Kostroma province we have isolated ß-sitosterol, the triterpenoids taraxerol, uvaol, and ursolic acid, the coumarin fraxetin, the known flavonoids quercetin, hyperoside, and 3,3',7-tri-O-methylquercetin, and a new natural flavonoid. The latter was isolated in the form of light yellow crystals with mp 188–190°C (from ethanol), with the composition C19H18O8. On the basis of IR, UV, NMR, and mass spectroscopy the structure of 4',5-dihydroxy-3,3',5',7-tetramethoxyflavone has been suggested for it. |
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