Flavonoids, referred to as Vitamin P from the mid-1930s to early 50s
Quercetin, a flavonoid from fruits and leaves, acts like curcumin and piperine.
Mangiferin (a pharmacologically active flavonoid, a natural xanthone C-glycoside) is extracted from Mango at high concentrations from the young leaves (172 g/kg), bark (107 g/kg), and from old leaves (94 g/kg).
Norwogonin is a flavone, a flavonoid-like chemical compound which is found in Scutellaria baicalensis.
Petunidin could form in the exocarp of fruits from delphinidin, with an anthocyanin flavonoid O-methyltransferase (Catechol-O-methyl transferase) catalyzing the B-ring methylation and S-Adenosyl-L-methyl-3H methionine being the methyl group donor.
Wogonin is an O-methylated flavone, a flavonoid-like chemical compound which was found in Scutellaria baicalensis.