Using Cc1nc(-c2ccc(C(F)(F)F)cc2)sc1CO, O=C1CCC(=O)N1Br to produce Cc1nc(-c2ccc(C(F)(F)F)cc2)sc1CBr, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.