[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [Br][Br].[C][O][C][=C][C][=C][Branch1][=C][C][S][C][=C][C][=N][C][Branch1][C][N][=C][Ring1][#Branch1][C][=C][Ring1][#C]>>[C][O][C][=C][C][=C][Branch1][#C][C][S][C][=C][C][Branch1][C][N][=N][C][=C][Ring1][#Branch1][Br][C][=C][Ring1][S]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O]"}]