Using COc1nc(/C(=C/CN2C(=O)c3ccccc3C2=O)c2ccc(C(C)(C)C)cc2)ccc1Cl to produce COc1nc(/C(=C/CN)c2ccc(C(C)(C)C)cc2)ccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.