[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [N][C][=C][C][=C][Branch1][O][O][C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Branch1][C][Br][=C][Ring1][#C]>>[N][C][=C][C][=C][Branch1][C][O][C][Branch1][C][Br][=C][Ring1][Branch2]"}, {"from": "gpt", "value": "[Cl][B][Branch1][C][Cl][Cl].[Cl][C][Cl]"}]