etioporphyrin


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e·ti·o·por·phy·rin

(ē'tē-ō-pōr'fi-rin),
A porphyrin derivative characterized by the presence on each of the four pyrrole rings of one methyl group and one ethyl group; four isomeric forms are thus possible.

etioporphyrin

a synthetic porphyrin used as a basis for the classification of porphyrins.