Using [N-]=[N+]=[N-], Cc1c(CCc2ccc3nc(N)oc3c2)nc2cc(CCl)ccn12 to produce Cc1c(CCc2ccc3nc(N)oc3c2)nc2cc(CN=[N+]=[N-])ccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.