[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a branched C8 alkane, comprising heptane with a methyl group attached at C-4. It has been found in Amaranth seeds. It has a role as a plant metabolite."}, {"from": "gpt", "value": "[C][C][C][C][Branch1][C][C][C][C][C]"}]