Using O=C1NC(=O)C(Cc2ccc(OCC(O)c3cccc(Cl)c3)cc2)S1 to produce O=C1NC(=O)C(Cc2ccc(OCC(=O)c3cccc(Cl)c3)cc2)S1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.