BUTENE
| Date | Clue |
|---|---|
| 2018-05-22 | Compound in synthetic rubber |
| 2010-07-30 | C4H8 |
| 2005-04-10 | C4H8 |
| 2002-12-02 | C4H8 |
| 1998-01-25 | Hydrocarbon derived from petroleum |
| Date | Clue |
|---|---|
| 2018-05-22 | Compound in synthetic rubber |
| 2010-07-30 | C4H8 |
| 2005-04-10 | C4H8 |
| 2002-12-02 | C4H8 |
| 1998-01-25 | Hydrocarbon derived from petroleum |