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Summary of major ions observed in MALDI-TOF/TOF fragmentation spectra from the m/z 1821 parent ion (YRKIDGGVCSMSLRF + Me-Pyr).a
| ion | Calcd m/z | Observed m/zb |
|---|---|---|
| y5 | 653.3 | 653.3 |
| y7* + Me-Pyr | 934.4 | 934.4 |
| y9* + Me-Pyr | 1090.5 | 1090.5 |
| y10* + Me-Pyr | 1147.5 | 1147.6 |
| y11* + Me-Pyr | 1262.6 | 1262.6 |
| y13* + Me-Pyr | 1503.7 | 1503.8 |
| b5 | 676.4 | 676.4 |
| b14* + Me-Pyr | 1657.8 | 1657.8 |
Me-Pyr stands for the 2-methylpyridine adduct (10) shown in Scheme 3.
The masses are reported with errors of ± 0.2 Da.
