Using CCCON, O=Cc1ccc(CCOc2c(Cl)cc(OCC=C(Cl)Cl)cc2Cl)cc1 to produce CCCON=Cc1ccc(CCOc2c(Cl)cc(OCC=C(Cl)Cl)cc2Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.