Using [NH4+], C[C@H]1COCc2nc3cnc4cc(Br)ccc4c3n21 to produce C[C@H]1COCc2nc3c(N)nc4cc(Br)ccc4c3n21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.