3,3,4,4-Tetra-fluoro-1-[2-(3,3,4,4-tetra-fluoro-pyrrolidin-1-yl)phen-yl]pyrrolidine.

The asymmetric unit of the title compound, C(14)H(12)F(8)N(2), contains one tetra-fluoro-pyrrolidine system and one half-mol-ecule of benzene; the latter, together with a second heterocyclic unit, are completed by symmetry, with a twofold crystallographic axis crossing through both the middle of the bond between the C atoms bearing the heterocyclic rings and the opposite C-C bonds of the whole benzene mol-ecule. The pyrrolidine ring shows an envelope conformation with the apex at the N atom. The dihedral angle between the least-squares plane of this ring and the benzene ring is 36.9 (5)°. There are intra-molecular C-H⋯N inter-actions generating S(6) ring motifs. In the crystal structure, the mol-ecules are linked by C-H⋯F inter-actions, forming chains parallel to [010].