[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [Br][Br].[C][C][=Branch1][C][=O][C][=C][C][=C][S][Ring1][Branch1]>>[O][=C][Branch1][Ring1][C][Br][C][=C][C][=C][S][Ring1][Branch1]"}, {"from": "gpt", "value": "[Br].[C][C][=Branch1][C][=O][O].[Cl][C][Branch1][C][Cl][Cl]"}]