[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a hydrocarbon and one of the isomers of pentene. Pentenes are components of gasoline and are often produced as by-products of catalytic of thermal cracking of petroleum. (L1287)"}, {"from": "gpt", "value": "[C][C][/C][=C][/C]"}]