| 摘要 |
A sulfenyl compound represented by the general formula: R-S-X (I)(wherein R represents an organic group having at least one constituent element labeled with an isotope, and X represents a leaving group); a labeling reagent comprising it; and a method of analyzing peptide using the labeling reagent. Preferably the organic group R comprises C, H, and N, and optionally O and/or P as the constituent element, and the isotope is a stable isotope selected from the group consisting of <2>H, <13>C, <15>N, <17>O, and <18>O. <IMAGE>
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