hypericin
noun
hy·per·i·cin
hī-ˈper-ə-sən 
: a violet crystalline pigment C30H16O8 from Saint-John's-wort that has a red fluorescence and causes hypericism
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“Hypericin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/hypericin. Accessed 23 Dec. 2024.
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