The 1H and 13C NMR spectra of apigeninidin chloride were assigned utilizing the two-dimensional δC, δH correlation and COLOC and HBMC techniques. The full 13C NMR data are reported for the first time. A good correlation was found between 13C chemical shifts and carbon charge obtained by AM1 calculation.
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Kouda-Bonafos et al. (1996) studied this question.