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castalin oak wood melaleuca quinquenervia hydrolyzable tannin polyphenol macrocycle rendering parasympathomimetic synthesis pharmacognosy mechanism biogenesis catabolism cycle compound derivative biosynthetic herbalism natural macrocyclic phytotherapy polycyclic pharmacopoeia metabolite ring substrate plant biosynthesis precursor endogenous contractor phytoalexin pathway enzyme heterocyclic aromatic metabolic heterocycle flavonoid aromaticity phytochemical herb alkaloid metabolism intermediate plant