[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [O][=C][Branch1][C][O-1][C][C][C][C][C][=Branch1][C][=O][O]>>[O][=C][Branch1][C][O][C][C][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "[O].[NH4+1]"}]