| 
   
  | Compound  | Precusor ion (m/z) | Cone voltage (V) | Collision energy (eV) | Product ion (m/z) |  
  | Elemental composition | Experimentalmass (m/z)
 | Theoreticalmass (m/z)
 | ΔmDa  | Δppm |  
  | MQCA | 189.0664 | 25 | 30 | C9H9N2 | 145.0765 | 145.0766 | 0.1 | 0.7 |  
  |   |   |   |   | C8H8N | 118.0659 | 118.0657 | 0.2 | 1.7 |  
  | QCT | 307.1083 | 25 | 28 | C18H13N2O | 273.1026 | 273.1028 | -0.2 | -0.7 |  
  |   |   |   |   | C17H13N2 | 245.1079 | 245.1079 | 0 | 0 |  
  | 1-DQCT | 291.1134 | 25 | 32 | C17H13N2 | 245.1070 | 245.1079 | -0.9 | -3.7 |  
  |   |   |   |   | C18H13N2O | 273.1029 | 273.1028 | 0.1 | 0.4 |  
  | 4-DQCT | 291.1134 | 25 | 32 | C17H13N2 | 245.1073 | 245.1079 | -0.6 | -2.4 |  
  |   |   |   |   | C9H8N2 | 144.0691 | 144.0687 | 0.4 | 2.8 |  
  | DQCT | 275.1184 | 25 | 35 | C17H13N2 | 245.1078 | 245.1079 | -0.1 | -0.4 |  
  |   |   |   |   | C16H11N2 | 231.0936 | 231.0922 | 1.4 | 6.1 |  |