3d image of hydroxymethylbilane skeletal formula

hydroxymethylbilane preuroporphyrinogen porphyrin haemoglobin myoglobin chlorophyll hmb pyrrole porphobilinogen enzyme porphobilinogen deaminase uroporphyrinogen iii synthase porphyrinogen hexahydroporphine macrocycle iii cyclization metabolite metabolism biosynthesis cycle mechanism pathway path catabolism biosynthetic intermediate biogenesis substrate precursor synthesis derivative bioprecursor metabolic endogenous molecule molecular formula skeletal structural structure geometry ball stick cell biology biochemistry biomolecule bioactive 3d