uroporphyrin

noun
uro·​por·​phy·​rin | \ ˌyu̇r-ō-ˈpȯr-fə-rən \

Medical Definition of uroporphyrin

: any of four isomeric porphyrins C40H38N4O16 which contain acetic acid and propionic acid groups on the porphin nucleus and are closely related to the coproporphyrins

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