Table 2.
ESIMS data of peptide labeling with ligand 3 (cf. Supporting Information File 1 for all details).
| Peptide | Peptide mass (M) | Detected masses after labeling (m/z) |
| ILMEHIHKL (M2) | 1132.6499 | 531.1584 [M + H]+ a, 832.4043 [M + 2H]2+ b (Figure 5) |
| YLLPAIVHI (M3) | 1037.6274 | 531.1584 [M + H]+ a, 784.8971 [M + 2H]2+ b (Figure S11, Supporting Information File 1) |
| EIAMATVTALR (M7) | 1174.6380 | 531.1586 [M + H]+ a, 853.4019 [M + 2H]2+ b (Figure S14, Supporting Information File 1) |
| ETIGEILKK (M8) | 1029.6071 | 531.1587 [M + H]+ a, 780.8868 [M + 2H]2+ b (Figure S17, Supporting Information File 1) |
| EGHIARNCRA (T3) | 1125.5462 | 531.1588 [M + H]+ a, no adduct observed (Figure S20, Supporting Information File 1) |
| RPQYAEASWNAR (S17) | 1447.6957 | 531.1585 [M + H]+ a, 989.9307 [M + 2H]2+ b (Figure S21, Supporting Information File 1) |
aInsertion product of 3 − N2 + H2O; bAdduct of 3 − N2 + H2O to the peptide.