Using O=C([O-])O, Nc1nc2cc(C(=O)c3ccccc3)ccc2n1CCC(=O)O to produce COC(=O)CCn1c(N)nc2cc(C(=O)c3ccccc3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.