protoporphyrin ix molecular structure 3d, flat model, porphyrin, structural chemical formula view from a microscope

protoporphyrin porphyrin ppix molecule molecular structure chemical formula model c34h34n4o4 atom skeletal biochemistry chlorophyll biology carbon chemistry research illustration iron nitrogen organic oxygen science hydrogen compound contractor mechanism cycle metabolism path structural pathway biosynthesis derivative enzyme hemoglobin metabolic substrate synthesis blood drug medical flat view from microscope microscope