Using O=C(O)c1cc(C=Cc2ccc(S(=O)(=O)Nc3ccccn3)cc2)ccc1O to produce O=C(O)c1cc(CCc2ccc(S(=O)(=O)Nc3ccccn3)cc2)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.