[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an alkene that is 2-methylhept-1-ene carrying a methyl group at position 4. It has a role as a human metabolite and an animal metabolite. It is an alkene and a volatile organic compound. It derives from a hydride of a heptane."}, {"from": "gpt", "value": "[C][C][C][C][Branch1][C][C][C][C][=Branch1][C][=C][C]"}]