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The  1 H and  13 CNMR spectra of some representative biflavonoids have been reinvestigated by proton-detected C-H correlation. Some assignments made in earlier publications are revised. Rules for the influence of one flavonoid moiety upon the chemical shift of the other’s protons are given.

1 HNMR Assignments in Biflavonoid Spectra by Proton-Detected C-H Correlation