[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a bismuth coordination entity. It has a role as an astringent."}, {"from": "gpt", "value": "[C][=C][Branch1][#C][C][=C][C][=Branch1][Branch1][=C][Ring1][=Branch1][O][O][Bi][O][Ring1][#Branch1][C][=Branch1][C][=O][O].[O]"}]