flavonolignans
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https://doi.org/10.1351/goldbook.09977
Flavonolignans have structures based on flavonoids condensed with
\(\ce{C6{-}C3}\)
lignan precursors.
Source:
PAC, 2018,
90
, 1429. 'Nomenclature of flavonoids (IUPAC Recommendations 2017)' on page 1435 (https://doi.org/10.1515/pac-2013-0919)