Sanz-Nebot, V., Benavente, F. and Barbosa, J. (2000) Separation and Char-acterization of Multicomponent Peptide Mixtures by Liquid Chromatography Electrospray Ionization Mass Spectrometry, Applications to Crude Products of the Synthesis of Leuprolide. Journal of Chromatography A, 870, 315-334.