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Department of Biomedical Science and Technology, Research Center for Transcription Control, Konkuk University, Seoul 143-701, KoreaReceived March 18, 2011, Accepted April 26, 2011Key Words : NMR, Flavonoids, Chemical shiftsPolyphenols are secondary metabolites that naturallyoccur in plants. Unlike alkaloids and terpenoids, they are notused widely as a therapeutic drug because of their mildbiological activities. However, if these compounds have lowtoxicities, they may be used as adjuvants for drugs.

1H and13C NMR Data on Hydroxy/methoxy Flavonoids and the Effects of Substituents on Chemical Shifts

¹H and¹³C NMR Data on Hydroxy/methoxy Flavonoids and the Effects of Substituents on Chemical Shifts