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Proposed pathway for the biosynthesis of the 3,5-hydroxy-4-methylanthranilic acid moiety in sibiromycin, which is the suggested substrate for the NRPS enzymes catalyzing diazepine ring formation. Pathway A is favored. The anthramycin biosynthesis is proposed to diverge at the formation of 3-hydroxy-4-methylanthranilic acid.
