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Extracted ion chromatograms using LC-ESI-Orbitrap-MS after an aldehyde (4), a ketone (4-phenyl-2-butanone), and a quinone (para-benzoquinone) were subjected to CAX labeling. A, The NL value for CAX-4 is 1.16E6. B, No CAX-labeled ketone was detected. The candidate peak at 20.5 min in B was rejected based on its mass (off by 10.1 ppm)
