Using O=C(Nc1ccc(CC2CCN(S(=O)(=O)c3ccccc3)CC2)cc1)C(F)(F)F to produce Nc1ccc(CC2CCN(S(=O)(=O)c3ccccc3)CC2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.