Using N=C(N)N, Cn1ccc2c(-n3cc(C(=O)Cl)c4cccnc43)ncnc21 to produce Cn1ccc2c(-n3cc(C(=O)NC(=N)N)c4cccnc43)ncnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.