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| # | Species | Formula |
| 1811 | 2,3,5,6-Tetrachloro-1,4-benzoquinone | C6O2Cl4 | |
| 1812 | 2,3,5,6-Tetrachloro-1,4-benzoquinone (Geo) | C6O2Cl4 | |
| 1813 | SOCl4 | OSCl4 | |
| 1814 | Pentachloroethane | HC2Cl5 | |
| 1815 | Pentachlorobenzene | HC6Cl5 | |
| 1816 | Pentachlorophenol | HC6OCl5 | |
| 1817 | Hexachloroethane (Geo) | C2Cl6 | |
| 1818 | Hexachloroethane | C2Cl6 | |
| 1819 | Hexachlorobenzene (Geo) | C6Cl6 | |
| 1820 | Hexachlorobenzene | C6Cl6 | |
| 1821 | gamma Hexachlorocyclohexane | C6H6Cl6 | |
| 1822 | Hexachloro-1,3,5,2,4,6-triazatriphosphorine | N3P3Cl6 | |
| 1823 | Hydrogen bromide, cation | HBr | |
| 1824 | Hydrogen bromide (Geo) | HBr | |
| 1825 | Hydrogen bromide | HBr | |
| 1826 | Bromomethane | CH3Br | |
| 1827 | Bromomethane (Geo) | CH3Br | |
| 1828 | Bromoacetylene | HC2Br | |
| 1829 | Bromoacetylene (Geo) | HC2Br | |
| 1830 | Bromoethylene | C2H3Br | |
| 1831 | Bromoethane | C2H5Br | |
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