Using O=C(NNC(=O)c1ccc2nc(-c3c(Cl)cccc3Cl)[nH]c2c1)c1ccc(Cl)cc1 to produce Clc1ccc(-c2nnc(-c3ccc4nc(-c5c(Cl)cccc5Cl)[nH]c4c3)o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.