Fig. 6: Confirmation of pharmaceutically relevant molecules through microbial fermentation.

A Confirmation of prodrug precursors 6-chloro-N-formyl-L-kynurenine (blue) and 6-bromo-N-formyl-L-kynurenine (orange). B Confirmation of new-to-nature molecules 7-chloro-1-acetyl-3-carboxy-β-carboline (blue) and 7-bromo-1-acetyl-3-carboxy-β-carboline (orange).