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| # | Species | Formula |
| 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 | |
| 657 | 2-(Diethylamino)-pentanenitrile | C9H18N2 | |
| 658 | 2,2-Bipyridyl | C10H8N2 | |
| 659 | 2,4-Bipyridyl | C10H8N2 | |
| 660 | 4,4'-Bipyridine | C10H8N2 | |
| 661 | 2,3-Dimethyl quinoxaline | C10H10N2 | |
| 662 | alpha N,N-dimethylamino phenylacetonitrile | C10H12N2 | |
| 663 | Ethyl(1,1-dimethylpropyl)malonodinitrile | C10H16N2 | |
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