Using COC(=O)CCc1cn(S(=O)(=O)c2ccc(OC)cc2)c2ccc(OC)cc12 to produce COc1ccc(S(=O)(=O)n2cc(CCC(=O)O)c3cc(OC)ccc32)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.