Hydrogen atoms were included at their geometrically estimated positions. One CF3 group was found to be disordered, and the two sites refined were with complementary occupancies. The C-F and F-F bonds were restrained to be equal across the two sites, and corresponding pairs of atoms (e.g. F17 in the two sites) were constrained to have equal anisotropic thermal displacement parameters. The two C(pyrrole)-C(CF3) bond lengths were restrained to have equal length.