Using CCOC(=O)C1CCN(c2cccc(-c3nc4ccccc4n3C(F)F)c2)CC1 to produce O=C(O)C1CCN(c2cccc(-c3nc4ccccc4n3C(F)F)c2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.