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A) Organization of the sfl biosynthetic gene cluster. B) Precursor peptide sequences of venezuelin and S-1022. C) Structure of venezuelin and the C-terminal fragment of trypsin-digested SflL-modified SflA confirmed by MS/MS. Corresponding b-/y-ions are highlighted in red ([M+H]+) and blue ([M+2H]2+) in the spectrum. D) GC-MS trace demonstrating the stereochemistry of the thioether crosslinks in modified SflA.
