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QUE biosynthetic pathway (ChemDraw® v.16.0 software). (a) Schematic biosynthesis mechanism from L-phenylalanine to the flavanone, naringenin. Naringenin structure is marked with a yellow colour box. (b) Schematic biosynthesis mechanism from naringenin to QUE. Its structure is marked with an orange colour box. Abbreviations of the involved catalytic enzymes are shown.
