3d image of imidazol-4-one-5-propionic acid skeletal formula

intermediate metabolism histidine imidazol-4-one-5-propionic acid imidazolone ring occurrence heterocycle urocanase urocanic imidazolonepropionate hydrolase type diabetes insulin signaling rendering metabolite biosynthesis cycle mechanism pathway path catabolism biosynthetic biogenesis substrate precursor synthesis derivative bioprecursor metabolic enzyme endogenous contractor human metabolome database hmdb molecule molecular structural structure formula skeletal geometry ball stick bioactive cell biochemistry biology biomolecule