[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo."}, {"from": "gpt", "value": "[C][C][=C][C][=Branch1][C][=O][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Ring1][O][=O]"}]