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