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| # | Species | Formula |
| 103 | Fulvene | C6H6 | |
| 104 | Fulvene (Geo) | C6H6 | |
| 105 | (E)-1,3,5-Hexatriene | C6H8 | |
| 106 | (Z)-1,3,5-Hexatriene | C6H8 | |
| 107 | 1,3-Cyclohexadiene | C6H8 | |
| 108 | 1,4-Cyclohexadiene | C6H8 | |
| 109 | 1-Methyl cyclopentene | C6H10 | |
| 110 | 1,2-Dimethylcyclobutene | C6H10 | |
| 111 | 3-Methyl cyclopentene | C6H10 | |
| 112 | 1,5-Hexadiene | C6H10 | |
| 113 | 4-Methyl cyclopentene | C6H10 | |
| 114 | Bicyclopropyl | C6H10 | |
| 115 | Cyclohexene (Geo) | C6H10 | |
| 116 | Cyclohexene | C6H10 | |
| 117 | Cyclohexyl, cation | C6H11 | |
| 118 | 1-Hexene | C6H12 | |
| 119 | (Z)-3-Methyl-2-pentene | C6H12 | |
| 120 | 2,3-Dimethyl-1-butene | C6H12 | |
| 121 | 4-Methyl-1-pentene | C6H12 | |
| 122 | 2,3-Dimethyl-2-butene | C6H12 | |
| 123 | Cyclohexane (Geo) | C6H12 | |
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