Using C[O-], O=c1[nH]c2ccccc2c2nc(-c3ccc(Cl)cc3)nn12 to produce Cn1c(=O)n2nc(-c3ccc(Cl)cc3)nc2c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.