uroporphyrin
noun
uro·por·phy·rin
ˌyu̇r-ō-ˈpȯr-fə-rən 
: 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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“Uroporphyrin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/uroporphyrin. Accessed 31 Oct. 2025.
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