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Biosynthesis of aldehyde-containing natural products by two electron reductive release, (a) Termination steps in the biosynthesis of fellutamide. (b) Structure of a flavopeptin. (c) Structure of leupeptin. (d) Structures of antipain and deimino-antipain. (e) Structure of dipeptide aldehyde from the gut microbiome. (f) Commensal microbe-derived dipeptide aldehydes are in equilibrium with their corresponding imine, but spontaneously convert to pyrazinones upon exposure to oxygen.
