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Biosynthetic pathway to fumiquinazoline C (FQC). The last step in the pathway involves oxidation of the secondary amine in fumiquinazoline A by the FAD-enzyme Af12070, followed by enzymatic intramolecular conversion of the nascent imine to the heptacyclic hemiaminal in FQC (path a) or nonenzymatic intramolecular conversion to the aminal FQD (path b).
