Using O=C(O)N1CCN(c2ccc(N3CCC4(CC3)CC4(F)F)cn2)c2ccccc21 to produce FC1(F)CC12CCN(c1ccc(N3CCNc4ccccc43)nc1)CC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.