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Phloroglucin microchemical testing shows that lignin is concentrated in lignified fibers located in fibrous vascular strands (Fig.
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.