Abstract
1 H Nmr examination of 6- or 8-isoprenoid substituted flavonols has shown that the location of isoprenoid side chain on A ring can be deduced from the chemical shift of the 5-hydroxy proton. The application of this 1 H nmr technique to identification of the isoprenoid substituted flavonols is discussed. The proposed structures for glepidotin A and two flavonols were revised with this method as well as chemical method
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