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Anup Padwal Best Answer
Protoporphyrin is an organic compound (it belongs to porphyrin group, that plays an important role in living organisms as a precursor to hemoglobin and chlorophyll. it contains the porphine core, a tetrapyrrole macrocycle that shows marked aromatic character. The key difference between porphyrin and protoporphyrin is that porphyrin is a group of aromatic chemicals which has four modified pyrrole subunits interconnected to each other, whereas protoporphyrin is a derivative of porphyrin which has propionic acid groups.