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Linear metabolites from S. lividans/pSET152+bern (T3A) expression, resulting from interruption of macrocycle production by proteolysis of the leader peptide; observed MS/MS fragmentation sites are highlighted for the linear T3A–Dha13 compound and are identical in the linear T3A–Ser13 metabolite. The stereochemistry shown for these linear metabolites is based on the structure of berninamycin A and its prepeptide and has not been confirmed spectroscopically.
