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. Author manuscript; available in PMC: 2016 Nov 3.
Published in final edited form as: Eur J Mass Spectrom (Chichester). 2015;21(3):183–190. doi: 10.1255/ejms.1374

Figure 2.

Figure 2

EI mass spectra of N-TFA derivatives of 2,O-dimethyl-N-p-tolyl-l-alanine (a), (S)-(+)-2-phenyl-N,O-dimethyl-l-glycine (b) and N-benzyl-O-ethyl-l-glycine (c).