Using COc1ccc(-n2nc(C(F)(F)F)c3c2C(=O)NCC3)cc1, O=C(O)CBr to produce COc1ccc(-n2nc(C(F)(F)F)c3c2C(=O)N(CC(=O)OC(C)(C)C)CC3)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.