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Word: Protoporphyrin
Speech Type: Noun
1920s; earliest use found in Chemical Abstracts. From proto- + porphyrin, after German Protoporphyrin
Any of a group of fifteen isomeric porphyrins having the formula C₃₄ H₃₄ N₄ O₄, in which the porphin nucleus has four methyl, two vinyl, and two propionic acid substituents; especially (more fully "protoporphyrin IX") the isomer which occurs widely in living organisms, mainly as haem (in which it is bonded to an iron atom).
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