Using O=C(CCCl)c1ccccc1, Nc1ccc(C(=O)c2ccccc2)cc1 to produce Nc1ccc(C(=C(CCCl)c2ccccc2)c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.