| No. | Compounds listed in Fig. 3 |
|---|---|
| 1 | N-Nitrosodimethylamine (NDMA) |
| 2 | N,N-Dimethylformamide (DMF) |
| 3 | 1-Methyl-1,2,4-triazole |
| 4 | 1-Methyl-4-methylaminocytosine |
| 5 | 2,4-Dimethyl-6-hydroxypyrimidine |
| 6 | N,N-Dimethyl urea (DMU) |
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