Using O=C(Cl)c1ccc(Cl)cc1, CCOC(=O)c1cc2ccsc2[nH]1 to produce CCOC(=O)c1cc2cc(C(=O)c3ccc(Cl)cc3)sc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.