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Proposed biosynthesis of thiostreptons A, Ala2-Ile-ΔIle1 and Ala2Val-ΔIle1. The top route reflects the maturation of thiostrepton A, when the second residue is Ala. The bottom route depicts the maturation of thiostreptons Ala2Ile-ΔIle1 and Ala2Val-ΔIle1, when the second residue is either Ile or Val.
