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n.1.(Chem.) A sweet white crystalline substance, metameric with pyrogallol, and obtained by the decomposition of phloretin, and from certain gums, as catechu, kino, etc. It belongs to the class of phenols. [Called also phloroglucinol.]
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On the other hand, no fragment for the known phloroglucin exclusion is detected, arguing for a substitution of the A-ring.
John's wort is the phloroglucin derivative hyperforin, which has long been known to possess antibacterial activity (Gurevich et al.