Using CCO, Cc1cnc2c(NC(=O)c3c(Cl)cccc3Cl)cccc2c1Cl to produce Cc1c[nH]c2c(NC(=O)c3c(Cl)cccc3Cl)cccc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.