GC-MS retention time and special characteristics of identified byproducts in the O3/VUV degradation of DDC at 20 min.
| No. | Molecular formula | Compounds | Retention time (min) | Similarity (%) | Main characteristic ions (m/z) |
|---|---|---|---|---|---|
| 1 | C5H11NO | N,N-diethylformamide | 4.099 | 99 | 58, 72, 86, 101, 102 |
| 2 | C4H9NO | N,N-dimethylacetamide | 6.185 | 91 | 58, 72, 73, 87 |
| 3 | C4H9NO | N-ethylacetamide | 6.406 | 96 | 72, 87 |
| 4 | C3H7NO | N-methylacetamide | 6.607 | 97 | 58, 73 |
| 5 | C5H8N2O2 | 5,6-Dihydro thymine | 7.697 | 99 | 127, 128, 129 |
| 6 | C3H5NO2 | N-formyl-N-methylformamide | 8.084 | 98 | 59, 87 |