Using COC(=O)c1ccccc1S(=O)(=O)Nc1ccc2ccccc2c1C(=O)OC to produce COC(=O)c1c(NS(=O)(=O)c2ccccc2C(=O)O)ccc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.