Using O=Cc1ccccc1, CCOC(=O)C(N)c1ccc(Cl)c(Cl)c1 to produce CCOC(=O)C(N=Cc1ccccc1)c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.