https://doi.org/10.1351/goldbook.09974
Neoflavones are compounds with a 4-phenyl-2$H$-1-benzopyran-2-one (4-phenyl-2$H$-chromen-2-one) skeleton 11. They may be substituted.
Source:
PAC, 2018, 90, 1429. 'Nomenclature of flavonoids (IUPAC Recommendations 2017)' on page 1433 (https://doi.org/10.1515/pac-2013-0919)
PAC, 2018, 90, 1429. 'Nomenclature of flavonoids (IUPAC Recommendations 2017)' on page 1433 (https://doi.org/10.1515/pac-2013-0919)