[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [N][C][=C][Branch1][=Branch1][N+1][=Branch1][C][=O][O-1][C][=C][C][Branch1][C][Cl][=C][Ring1][#Branch2][Cl]>>[N][C][=C][C][=C][Branch1][C][Cl][C][Branch1][C][Cl][=C][Ring1][Branch2][N]"}, {"from": "gpt", "value": "[C][C][O].[O].[H][H].[Ni]"}]