| No. | X | Molecular | Calculated | Experimental |
|---|---|---|---|---|
| Formula | Mass | Mass | ||
| 5a | p-CN | C19H21N5 | 319.1797 amu | 319.1791 amu |
| 5b | p-CO2Me | C20H24N4O2 | 352.1899 amu | 352.1892 amu |
| 5c | p-Br | C18H21N4Br | 372.0949 amu | 372.0963 amu |
| 5d | p-NO2 | C18H21N5O2 | 339.1695 amu | 339.1683 amu |
| 5e | H | C18H22N4 | 294.1844 amu | 294.1845 amu |