Reconstructed ion chromatogram of 70 compounds detected in 20 min. Extracted ion chromatograms for each compound at the highest concentration calibration standard run, were normalized to highest intensity and overlaid. Reprinted from Journal of Chromatography A, 1446, Wong, J.-M.T.; Malec, P. A.; Mabrouk,; O.S. Ro, J.; Dus, M.; Kennedy, R.T. Benzoyl chloride derivatization with liquid chromatography-mass spectrometry for targeted metabolomics of neurochemicals in biological samples, pages 78–90 (ref 99). Copyright 2016,with permission from Elsevier