Using COC(=O)c1ccc2c(c1)[C@@H](NC(=O)c1ccccc1Cl)CCC2 to produce O=C(O)c1ccc2c(c1)[C@@H](NC(=O)c1ccccc1Cl)CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.