[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a member of chromenes. It has a role as a member of precocenes."}, {"from": "gpt", "value": "[C][C][O][C][=C][Branch2][Ring1][Ring1][C][=C][C][=C][C][Branch1][Branch2][O][C][Ring1][=Branch1][=C][Ring1][#Branch2][Branch1][C][C][C][O][C]"}]