Using CCOC=O, Cc1cc(C(=O)Nc2cccc(C(=O)c3ccc4c(c3)NC(=O)C4)c2)n(C)n1 to produce Cc1cc(C(=O)Nc2cccc(C(=O)c3ccc4c(c3)NC(=O)C4=CO)c2)n(C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.