Neoflavonoids are a class of polyphenolic compounds.[1] While flavonoids (in the narrow sense) have the 2-phenylchromen-4-one backbone, neoflavonoids have the 4-phenylchromen backbone with no hydroxyl group substitution at position 2.
^Ollis, W. D. (1966). "The neoflavanoids, a new class of natural products". Experientia. 22 (12): 777–783. doi:10.1007/BF01897407. PMID5973205.