Assignment of the major fragment ions obtained from the protonated compound A (C23H30N5O4) using a quadrupole time-of-flight II mass spectrometer
Fragment Ion | Observed Mass | Elemental Composition | Theoretical Mass | Error | |
|---|---|---|---|---|---|
| Da | Da | ppm | |||
| 380 | 380.2088 | C21H26N5O2 | 380.2087 | 0.5 | |
| 261 | 261.1706 | C14H21N4O | 261.1715 | 3.5 | |
| 180 | 180.0653 | C9H10NO3 | 180.0661 | 4.4 | |
| 175 | 175.1231 | C11H15N2 | 175.1235 | 2.3 | |
| 138 | 138.0545 | C7H8NO2 | 138.0555 | 7.5 | |