| Product Name | CAS No. | FEMA | Structural formula |
| Pyrazine | 290-37-9 | 4015 |  |
| 2-Methyl pyrazine | 109-08-0 | 3309 |  |
| 2,3-Dimethyl pyrazine | 5910-89-4 | 3271 |  |
| 2,5(or6)-Dimethyl pyrazine | 123-32-0 | 3272 |  |
| 2,6-Dimethyl pyrazine | 108-50-9 | 3273 |  |
| 2,3,5-Trimethyl pyrazine | 14667-55-1 | 3244 |  |
| 2,3,5,6-Tetramethyl pyrazine | 1124-11-4 | 3237 |  |
| 2-Ethyl pyrazine | 13925-00-3 | 3281 |  |
| 2,3-Diethyl pyrazine | 15707-24-1 | 3136 |  |
| 2-Ethyl-3-methyl pyrazine | 15707-23-0 | 3155 |  |
| 2,3-Diethyl-5-methyl pyrazine | 18138-04-0 | 3336 |  |
| 2-Ethyl-5(or6)-methyl pyrazine | 13360-64-0 | 3154 |  |
| 2-Ethyl-3,(5or6)-dimethyl pyrazine | 13925-07-0 | 3149 |  |
| 2-Isobutyl-3-methyl pyrazine | 13925-06-9 | 3133 |  |
| 2-Methoxy pyrazine | 3149-28-8 | 3302 |  |
| 2-Methyl-3-methoxy pyrazine | 2847-30-5 | 3183 |  |
| 2-Methoxy-3(5or6)-methoxy pyrazine | 2847-30-5 | 3183 |  |
| 2-Ethyl-3-methoxy pyrazine | 25680-58-4 | 3280 |  |
| 2-Methoxy-3-isopropyl pyrazine | 25773-40-4 | 3358 |  |
| 2-Methoxy-3-isobutyl pyrazine | 24683-00-9 | 3132 |  |
| 2-Methoxy-3-secbutyl pyrazine | 24168-70-5 | 3433 |  |
| 2-Methylthio pyrazine | 21948-70-9 | 3231 |  |
| 2-Methyl-3-methylthio pyrazine | 2882-20-4 | 3208 |  |
| 2-Methyl-3(5or6)-（methylthio) pyrazine | 67952-65-2 | 3208 |  |
| 2-Methyl-3(5or6)-ethoxy pyrazine | 32737-14-17 | 3569 |  |
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