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| # | Species | Formula |
| 538 | n-Pentylmalonodinitrile | C8H12N2 | |
| 539 | Tetramethylbutanedinitrile | C8H12N2 | |
| 540 | Tetramethylpyrazine | C8H12N2 | |
| 541 | 1,4-Dimethyl-2,3-diaza-bicyclo[2.2.2]oct-2-ene | C8H14N2 | |
| 542 | 3,4,5,6-Tetrahydro-3,3,6,6-tetramethylpyridazine | C8H16N2 | |
| 543 | Di-n-butyldiazene | C8H18N2 | |
| 544 | Di-tert-butyldiazene | C8H18N2 | |
| 545 | 1,2-Dibutylhydrazine | C8H20N2 | |
| 546 | 3-Quinolinamine | C9H8N2 | |
| 547 | 5-Quinolinamine | C9H8N2 | |
| 548 | 6-Quinolinamine | C9H8N2 | |
| 549 | 8-Quinolinamine | C9H8N2 | |
| 550 | 2-(Diethylamino)-pentanenitrile | C9H18N2 | |
| 551 | 2,2-Bipyridyl | C10H8N2 | |
| 552 | 2,4-Bipyridyl | C10H8N2 | |
| 553 | 4,4'-Bipyridine | C10H8N2 | |
| 554 | 2,3-Dimethyl quinoxaline | C10H10N2 | |
| 555 | alpha N,N-dimethylamino phenylacetonitrile | C10H12N2 | |
| 556 | Ethyl(1,1-dimethylpropyl)malonodinitrile | C10H16N2 | |
| 557 | Meso-2,3-diethyl-2,3-dimethylsuccinodinitrile | C10H16N2 | |
| 558 | Methyl(1,1,2-trimethylpropyl)malonodinitrile | C10H16N2 | |
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