Using COC(=O)c1cc(C(=O)c2nc(Br)c3ccccn23)ccc1N to produce Nc1ccc(C(=O)c2nc(Br)c3ccccn23)cc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.