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. Author manuscript; available in PMC: 2009 Dec 3.
Published in final edited form as: Anal Chem. 2009 Mar 1;81(5):1881–1887. doi: 10.1021/ac801745d

Figure 1.

Figure 1

Structure of (A) desmosine (DES) (X,R = H); deuterated desmosine (D4-DES) (X = d, R = H); propionylated desmosine (DES(prop)) (X = H, R = COCH2CH3), and (B) isodesmosine (IDES) (R = H); propionylated isodesmosine (IDES(prop)) (R = COCH2CH3).