Using COC(=O)c1nc(Br)cnc1N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C, OCC(F)(F)F to produce COC(=O)c1nc(OCC(F)(F)F)cnc1N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.