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| # | Species | Formula |
| 241 | Acenaphthylene | C12H8 | |
| 242 | Biphenylene | C12H8 | |
| 243 | Acenaphthene | C12H10 | |
| 244 | Biphenyl | C12H10 | |
| 245 | Hexamethylbenzene | C12H18 | |
| 246 | Hexylcyclohexane | C12H24 | |
| 247 | n-Duodecane | C12H26 | |
| 248 | Fluorene | C13H10 | |
| 249 | Tri-t-butylmethane | C13H28 | |
| 250 | Tridecane | C13H28 | |
| 251 | Anthracene | C14H10 | |
| 252 | Diphenylethyne | C14H10 | |
| 253 | Phenanthrene | C14H10 | |
| 254 | 9-Methyl-9H-fluorene | C14H12 | |
| 255 | Stilbene | C14H12 | |
| 256 | 9,10-Dihydro-phenanthrene | C14H12 | |
| 257 | Bibenzyl | C14H14 | |
| 258 | 1,2,3,4-Tetrahydrophenanthrene | C14H14 | |
| 259 | 4,4'-Dimethylbiphenyl | C14H14 | |
| 260 | 1,4,5,8-Tetramethynaphthalene | C14H16 | |
| 261 | 1,2,3,4,5,6,7,8-Octahydro-anthracene | C14H18 | |
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