porphyroxine
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porphyroxine — por·phy·rox·ine .pȯr fə räk sən n a crystalline opium alkaloid C19H23NO4 whose solution in dilute acid turns red on exposure to air … Medical dictionary
porphyroxine — por·phyr·oxine … English syllables
Papaverine — Systematic (IUPAC) name … Wikipedia