Using COC(=O)c1cscc1NC(=O)CCl, Oc1ccc(Cl)c(Cl)c1 to produce COC(=O)c1cscc1NC(=O)COc1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.