3d image of hexahydroporphine skeletal formula

hexahydroporphine calixpyrrole porphyrinogen pyrrole ring methylene bridge non-aromatic macrocycle tetrapyrrole porphine methine porphyrinogens uroporphyrinogen iii urogen porphyrins metabolic protoporphyrinogen oxidase complexes metabolite metabolism biosynthesis cycle mechanism pathway path biosynthetic intermediate biogenesis substrate precursor synthesis derivative bioprecursor endogenous biology biochemistry biomolecule bioactive biochemical substance compound component reagent reaction 3d