Using CCOC(=O)c1cc(N2CCC(n3c(=O)[nH]c4ncccc43)CC2)ncn1 to produce O=C(O)c1cc(N2CCC(n3c(=O)[nH]c4ncccc43)CC2)ncn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.