Using O=C(OCc1ccccc1)[C@@H](CC(=O)N1CCOCC1)NS(=O)(=O)c1ccc(Oc2ccccc2)cc1 to produce O=C(O)[C@@H](CC(=O)N1CCOCC1)NS(=O)(=O)c1ccc(Oc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.