flavonolignans

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)