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| # | Species | Formula |
| 636 | Trimethyl pyrazine | C7H10N2 | |
| 637 | 1-Piperidineacetonitrile | C7H12N2 | |
| 638 | 3,3,5,5-Tetramethyl-1-pyrazoline | C7H14N2 | |
| 639 | m-Dicyanobenzene | C8H4N2 | |
| 640 | o-Dicyanobenzene | C8H4N2 | |
| 641 | p-Dicyanobenzene | C8H4N2 | |
| 642 | Phthalazine | C8H6N2 | |
| 643 | Quinazoline | C8H6N2 | |
| 644 | Quinoxaline | C8H6N2 | |
| 645 | n-Pentylmalonodinitrile | C8H12N2 | |
| 646 | Tetramethylbutanedinitrile | C8H12N2 | |
| 647 | Tetramethylpyrazine | C8H12N2 | |
| 648 | 1,4-Dimethyl-2,3-diaza-bicyclo[2.2.2]oct-2-ene | C8H14N2 | |
| 649 | 3,4,5,6-Tetrahydro-3,3,6,6-tetramethylpyridazine | C8H16N2 | |
| 650 | Di-n-butyldiazene | C8H18N2 | |
| 651 | Di-tert-butyldiazene | C8H18N2 | |
| 652 | 1,2-Dibutylhydrazine | C8H20N2 | |
| 653 | 3-Quinolinamine | C9H8N2 | |
| 654 | 5-Quinolinamine | C9H8N2 | |
| 655 | 6-Quinolinamine | C9H8N2 | |
| 656 | 8-Quinolinamine | C9H8N2 | |
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