Using COC(=O)C(=O)CBr, Nc1ccc(C(F)(F)c2nnc3ccc(Br)cn23)nn1 to produce COC(=O)c1cn2nc(C(F)(F)c3nnc4ccc(Br)cn34)ccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.