Using COC(=O)c1cc(Cl)cc(NCCNC(=O)OC(C)(C)C)c1C, O=C([O-])[O-] to produce COC(=O)c1cc(Cl)cc(N(C)CCNC(=O)OC(C)(C)C)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.