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(a) AetE reaction with 5-bromo-l-tryptophan (5). Chromatograms are high-performance liquid chromatography (HPLC) traces monitored at 280 nm. (b) AetA reaction with 5-bromoindole (7) and 3,5-dibromoindole (8). Chromatograms are the EICs of 7 (m/z 193.9611), 8 (m/z 273.8696), and 3 (m/z 351.7801) analyzed in negative ionization mode.
