Using CCOC(=O)C(=Cc1nccn1Cc1cc(Cl)cc(Cl)c1)Cc1ccccc1 to produce CCOC(=O)C(Cc1ccccc1)Cc1nccn1Cc1cc(Cl)cc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.