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| # | Species | Formula |
| 268 | alpha-Methyl styrene | C9H10 | |
| 269 | Cyclopropyl benzene | C9H10 | |
| 270 | 1,3,5-Trimethyl cyclohexane | C9H18 | |
| 271 | cis-cis-trans-1,3,5-Trimethyl cyclohexane | C9H18 | |
| 272 | 3,3-Diethylpentane | C9H20 | |
| 273 | n-Nonane | C9H20 | |
| 274 | Tri-isopropylborane | H21BC9 | |
| 275 | Tripropylborane | H21BC9 | |
| 276 | Azulene | C10H8 | |
| 277 | Naphthalene (Geo) | C10H8 | |
| 278 | Naphthalene | C10H8 | |
| 279 | 1,4-Dicyclopropylbuta-1,3-diyne | C10H10 | |
| 280 | 1-Butynl benzene | C10H10 | |
| 281 | 2a,4a,6a,6b-Tetrahydrocyclopentapentalene | C10H10 | |
| 282 | Bulvalene | C10H10 | |
| 283 | Diisopropenyldiacetylene | C10H10 | |
| 284 | Tricyclo[6.2.0.0]deca-1(8),2,6-triene | C10H10 | |
| 285 | 1,2,6,7-Cyclodecatetraene | C10H12 | |
| 286 | Dispiro[2.2.2.2]deca-4,9-diene | C10H12 | |
| 287 | Tetralin | C10H12 | |
| 288 | (1-Methylpropyl) benzene | C10H14 | |
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