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Feeding experiments with deuterium-labelled precursors to Fraxinus excelsior, Syringa josikaea and S. vulgaris have shown that the biosynthesis of the oleoside-type secoiridoids (e.g. oleuropein) proceeds via iridodial, iridotrial, deoxy-loganic acid aglucon and deoxy-loganic acid. Hydroxylation of the 7α-position is followed by oxidation and methylation of C-11 to give 7-ketologanin, the last carbocyclic...
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