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. Author manuscript; available in PMC: 2010 Dec 30.
Published in final edited form as: J Am Chem Soc. 2009 Dec 30;131(51):18263–18265. doi: 10.1021/ja909170u

Figure 3.

Figure 3

HRMS of the A) unlabeled valine ureido-dipeptide, B) [13C]-labeled valine ureido-dipeptide, and C) [18O]-labeled valine ureido-dipeptide with normalization of ion abundance shown below.