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. Author manuscript; available in PMC: 2020 Sep 28.
Published in final edited form as: Chem Biodivers. 2009 Apr;6(4):527–539. doi: 10.1002/cbdv.200800277

Fig. 3. LC/MS of the crude reaction mixture containing seven compounds.

Fig. 3.

Signals are marked corresponding to peaks for cysteinyl-glycine (1), pyroglutamic acid (2) and 5-oxoproline (3), glutamic acid (4), cysteinesulfenic acid (5), 2-amino-3-oxopropanoic acid (6), and glycine (7). Degradation studies were carried out at 37° and pH 7.4 (a), 6.8 (b), and 6.2 (c).