Using [NH4+], CCCNC(=O)CCCn1c(CCC)nc2cnc3ccccc3c21 to produce CCCNC(=O)CCCn1c(CCC)nc2c(N)nc3ccccc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.