Using O=C([O-])[O-], CC(=O)OCCc1cc(Cl)c(Oc2cc(C(C)C)c(=O)[nH]n2)c(Cl)c1 to produce CC(=O)OCCc1cc(Cl)c(Oc2cc(C(C)C)c(=O)n(C)n2)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.