Using O=C(N1CCc2ccc([N+](=O)[O-])cc2CC1)C(F)(F)F to produce Nc1ccc2c(c1)CCN(C(=O)C(F)(F)F)CC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.