Using [NH4+], NC(=O)c1ccc(Br)c2c3c([nH]c12)CC(C=O)CC3 to produce NCC1CCc2c([nH]c3c(C(N)=O)ccc(Br)c23)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.