Using O=C(O)c1ccc(C=Cc2cc(Cl)ccc2NS(=O)(=O)c2ccc(Cl)cc2)cc1 to produce O=C(O)c1ccc(CCc2cc(Cl)ccc2NS(=O)(=O)c2ccc(Cl)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.