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. 2015 Nov 19;291(4):1735–1750. doi: 10.1074/jbc.M115.700989

FIGURE 12.

FIGURE 12.

LC-MS chromatogram of the precursor ion m/z 262 (negative ion mode) (S-acetyl-N-Boc-l-Cys and N-acetyl-N-Boc-l-Cys) and LC-MS/MS chromatogram of the fragment ions m/z 75 (negative ion mode) derived from the intermediate, S-acetyl-N-Boc-l-Cys, and m/z 33 (negative ion mode) derived from the final product, N-acetyl-N-Boc-l-Cys. The structural formulae show S-acetyl-N-Boc-l-Cys and N-acetyl-N-Boc-l-Cys. The theoretical m/z values of the fragments are given with the structures. CE, collision energy.