Using O=C1CCCCC(Cc2ccc(N3CC(=O)NS3(=O)=O)c(OCc3ccccc3)c2)N1 to produce O=C1CCCCC(Cc2ccc(N3CC(=O)NS3(=O)=O)c(O)c2)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.