Using C[C@H](c1ccccc1)n1c(N)nc2c(Cl)nc3ccccc3c21, N to produce C[C@H](c1ccccc1)n1c(N)nc2c(N)nc3ccccc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.