Using O=C(O)C(=O)O, Nc1ccc2c(S(=O)(=O)O)cccc2c1N to produce O=S(=O)(O)c1cccc2c1ccc1nc(O)c(O)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.