Using CCOCC1CO1, O=c1[nH]nc2c(-c3ccc(Cl)cc3)c(-c3ccc(Cl)cc3)cnn12 to produce CCOCC(O)Cn1nc2c(-c3ccc(Cl)cc3)c(-c3ccc(Cl)cc3)cnn2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.