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| # | Species | Formula |
| 581 | Tetracyanoethylene | C6N4 | |
| 582 | 1,3,5,7-Tetraazaadamantane | C6H12N4 | |
| 583 | Melamine | C3H6N6 | |
| 584 | Oxygen, atom | O | |
| 585 | Hydroxyl radical | HO | |
| 586 | Hydroxide, anion | HO | |
| 587 | Water (Geo) | H2O | |
| 588 | Water | H2O | |
| 589 | Hydronium, cation | H3O | |
| 590 | Carbon monoxide | CO | |
| 591 | Carbon monoxide (Geo) | CO | |
| 592 | HCO, cation | HCO | |
| 593 | HCO | HCO | |
| 594 | Formaldehyde (Geo) | CH2O | |
| 595 | Formaldehyde | CH2O | |
| 596 | CH2OH, cation | CH3O | |
| 597 | Methoxy, radical | CH3O | |
| 598 | Methoxy, anion | CH3O | |
| 599 | Methanol (Geo) | CH4O | |
| 600 | Methanol | CH4O | |
| 601 | Ketene (Geo) | C2H2O | |
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