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The biosynthetic pathway of gallic acid in leaves of Rhus typhina is studied by oxygen isotope ratio mass spectrometry at natural oxygen isotope abundance. The observed δ 18 O-values of gallic acid indicate an 18 O-enrichment of the phenolic oxygen atoms of more than 30‰ above that of the leaf water. This enrichment implies biogenetical equivalence with oxygen atoms of carbohydrates...
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