Using O=C([O-])[O-], COC(=O)C(C)c1cc(Cl)c2c(c1)C=CC(C)(C)N2 to produce COC(=O)C(C)c1cc(Cl)c2c(c1)C(=O)CC(C)(C)N2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.