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HPLC-electrospray ionization-MS of S16I mersacidin. (A) Total ion chromatogram obtained after separation of the fraction containing S16I mersacidin. (B) Extracted chromatogram for peaks with masses in the range of 1869.0 to 1872.5 Da. (C) Mass determined for the peak detected at 21.28 min (expected mass for S16I mersacidin, 1,869.32 Da).
