| Chapter Code | Chapter Description |
|---|
| 290121 | UNSATURATED : ETHYLENE |
| 290122 | UNSATURATED : PROPENE (PROPYLENE) |
| 290123 | UNSATURATED : BUTENE (BUTYLENE) AND ISOMERS THEREOF |
| 290124 | UNSATURATED : BUTA-1,3-DIENE AND ISOPRENE |
| 290129 | UNSATURATED: OTHER |
| 290211 | CYCLANES, CYCLONES AND CYCLOTERPENES : CYCLOHEXANE |
| 290219 | CYCLANES, CYCLONES AND CYCLOTERPENES : OTHER |
| 290220 | BENZENE |