[{"from": "human", "value": "Based on the given chemical reaction, suggest some possible reagents. [C][C][=C][C][=C][Branch1][C][O][C][Branch1][Ring1][C][O][=N][Ring1][=Branch2]>>[C][C][=C][C][=C][Branch1][C][O][C][Branch1][Ring1][C][=O][=N][Ring1][=Branch2]"}, {"from": "gpt", "value": "[C][C][O][C][C][O][Ring1][=Branch1].[C][C][O].[O][=Se][=O]"}]