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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Anal Chem. 2016 Oct 14;88(21):10687–10692. doi: 10.1021/acs.analchem.6b03191

Figure 1.

Figure 1

Chemical structures of urinary diamine metabolites of corresponding aromatic diisocyanates. Chemical structures of diisocyanates are identical except –NH2 groups in aromatic rings are substituted by –NCO groups