etioporphyrin

noun
etio·​por·​phy·​rin
variants: or chiefly British aetioporphyrin \-​ˈpȯr-​fə-​rən \

Medical Definition of etioporphyrin 

: any of four isomeric porphyrins C32H38N4 especially : a violet crystalline pigment occurring in nature (as in petroleum and coal) and formed by degradation of chlorophyll and of heme

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