Using CON(Cc1ccc(Cl)c(Cl)c1)C(=O)C=C1OC(C)(C)OC1=O to produce COC(=O)C(O)=CC(=O)N(Cc1ccc(Cl)c(Cl)c1)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.