thus , the introduction of the 3'-hydroxyl group is clearly achieved by hydroxylation of c15-intermediates , and the concomitant occurrence of the 3',4'-hydroxylated flavonoids quercetin and cyanidin ( paeonidin ) in the presence of the functional allele ht1 is due to the action of one specific hydroxylase catalysing the hydroxylation of common precursors for both flavonols and anthocyanins .
C0596577
flavonoids
C0060444
flavonols