Using O=C(OC(=O)C(F)(F)F)C(F)(F)F, CCOCN(C(=O)CS(C)=O)c1cccc(C(F)(F)F)c1 to produce O=C1C(O)OCN1c1cccc(C(F)(F)F)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.