Using C1=CCC=C1, O=C(c1ccc(Cl)cc1)c1ccc(Cl)cc1 to produce Clc1ccc(C(=C2C=CC=C2)c2ccc(Cl)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.