Using O=C1CC2(CC(C#Cc3cccc(Cl)c3)=NO2)c2ccccc21, CON to produce CON=C1CC2(CC(C#Cc3cccc(Cl)c3)=NO2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.