Using CC(C)(C)OC(=O)NC1(C(=O)O)CC1, NCC(F)(F)F to produce CC(C)(C)OC(=O)NC1(C(=O)NCC(F)(F)F)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.