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Examination of OXA-58ΔSP inactivation by compounds 3 and 4 with ESI-MS (deconvoluted ESI-MS spectra). In these experiments OXA-58ΔSP at 110 μm was incubated with compounds 3 or 4 at 5 mm for 1 h or 20 min, respectively, in 50 mm sodium phosphate, pH 7.0, at room temperature. The mixtures were desalted and subjected to ESI-MS for analysis.
