porphyroxine
noun
por·phy·rox·ine
ˌpȯr-fə-ˈräk-sən 
: a crystalline opium alkaloid C19H23NO4 whose solution in dilute acid turns red on exposure to air
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“Porphyroxine.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/porphyroxine. Accessed 22 Dec. 2024.
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