[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [C][O][C][=N][C][=C][C][=C][Ring1][=Branch1][C][=O]>>[C][O][C][=N][C][=C][C][=C][Ring1][=Branch1][C][O]"}, {"from": "gpt", "value": "[C][O].[BH4-1].[Na+1]"}]