Using O=C(Nc1ccc(Cl)cc1)c1cc(Cl)ccc1NC(=O)c1sc(CO)cc1Cl to produce O=Cc1cc(Cl)c(C(=O)Nc2ccc(Cl)cc2C(=O)Nc2ccc(Cl)cc2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.