Using O=C([O-])c1cccc2c1nc(Nc1cccc(Cl)c1)c1ccncc12 to produce O=C(O)c1cccc2c1nc(Nc1cccc(Cl)c1)c1ccncc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.