| (a) | |||
|---|---|---|---|
| Empirical formula | Molecular massa | Percentage changeb | |
| (1) N-alpha-phenylacetyl-glutamine | C13H16N2O4 | 264.1110 | 227 |
| (2) 3-aryl-5-oxoproline ethyl ester | C13H15NO3 | 233.1052 | 303 |
| (3) 5-methyl-DL-tryptophan | C12H14N2O2 | 218.1055 | 40 |
| (4) N-alpha-BOC-L-tryptophan | C16H20N2O4 | 304.1423 | 333 |
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