| Clue | Source | Date |
|---|---|---|
| Gas bottled up in polythene tubes | ||
| Compound in synthetic rubber | New York Times | 22 May 2018 |
| Compound in synthetic rubber | ||
| Hydrocarbon obtained from crude oil | LA Times Daily | 10 Jun 2016 |
| Hydrocarbon obtained from crude oil | ||
| Carbon compound found in crude oil | LA Times Daily | 07 Mar 2015 |
| Carbon compound found in crude oil | ||
| Gas is not entirely fresh | ||
| C4H8 | ||
| Compound found in synthetic rubber | ||
| Hydrocarbon derived from petroleum | ||
| C4H8 |