coproporphyrin

noun

cop·​ro·​por·​phy·​rin ˌkäp-rə-ˈpȯr-fə-rən 

: any of four isomeric porphyrins C₃₆H₃₈N₄O₈ of which types I and III are found in feces and urine especially in certain pathological conditions and also in yeast