[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [C][O][C][=C][C][=C][Branch1][C][Cl][C][Branch1][Ring1][S][C][=C][Ring1][=Branch2]>>[C][S][C][=C][C][Branch1][C][O][=C][C][=C][Ring1][#Branch1][Cl]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[Cl][C][Cl].[O][C][C][N][C][C][O]"}]