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Chromatographic investigations on Helichrysum bracteatum revealed the presence of three flavanones in the bracts. Two of them were the well known flavanones naringenin and erio- dictyol. The third flavanone was identified as the hitherto in nature unknown 5,7,3′,4′,5′- pentahydroxyflavanone. This was accomplished by chromatographic and spectrophotometric comparison with an authentic sample prepared from 3,4,5,2′,4′,6′-hexahydroxychalcone-2′- glucoside. Moreover, precursor experiments with suitable white flowering mutants of Matthiola incana and Antirrhinum majus also confirmed that the third compound was identical with 5,7,3′,4′,5′-pentahydroxyflavanone.

5,7,3′,4′5′-pentahydroxyflavanone in the bracts of helichrysum bracteatum