3d image of n-formylkynurenine skeletal formula

n-formylkynurenine intermediate catabolism tryptophan formylated derivative kynurenine heme dioxygenases metabolite metabolism biosynthesis cycle mechanism pathway path biosynthetic biogenesis substrate precursor synthesis bioprecursor metabolic enzyme endogenous contractor human metabolome database hmdb trp amino acid protein neurotransmitter serotonin hormone melatonin vitamin b3 protein tryptophan gastrointestinal microbiota supplement rendering bioactive cell biochemistry biology biomolecule