Using CI, COc1c(Cl)cc(NC(=O)OC(C)(C)C)c(C(=O)O)c1Cl to produce COC(=O)c1c(NC(=O)OC(C)(C)C)cc(Cl)c(OC)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.