Using Cl, COC(=O)C1(O)ON=C(c2occc2Cl)C1c1ccccc1 to produce O=C(O)c1onc(-c2ccc(Cl)o2)c1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.