Using O=C1Nc2ccc(Cl)cc2C1=C1OCc2cc(NC(c3ccccc3)(c3ccccc3)c3ccccc3)ccc21 to produce Nc1ccc2c(c1)COC2=C1C(=O)Nc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.