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UPLC-extracted ion chromatography MS (EIC-MS) in the negative ionization mode of XimA in vitro assay. (A) xiamenmycin (1); (B) XimA incubated with xiamenmycin B (3) and L-threonine; (C) boiled XimA incubated with xiamenmycin B (3) and L-threonine.
