Using CC(C)(C)OC(=O)NC(C)(C)C(=O)O, NCC(F)(F)F to produce CC(C)(C)OC(=O)NC(C)(C)C(=O)NCC(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.