Using O=C([O-])[O-], CCc1nn(Cc2cccc(O)n2)c2cccc(NC(=O)c3cn4ccccc4n3)c12 to produce CCc1nn(Cc2cccc(=O)n2C)c2cccc(NC(=O)c3cnc4ccccn34)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.