A single crystal was coated in Paratone oil (Hampton Research) and mounted on MiTeGen loops. It was flash frozen in a liquid nitrogen stream of the Oxford Cryostream. Diffraction data were measured at a low temperature of 100(2) K using Cu Kα λ = 1.54184 Å on a Rigaku Synergy R diffractometer equipped with a HyPix Arc-150° detector. The Rigaku data were processed and reduced with CrysAlisPro 1.171.41.111a. The structure was solved with SHELXT-2018/2 and refined with SHELXL-2016/4. All non-hydrogen atoms were refined anisotropically and hydrogens were placed in calculated positions and refined in riding mode. The solvent masking protocol of Olex2 36 was run. The crystal data and the structural refinement are summarized in Table . The hexagonal channels contain DMF and acetate counterions and were not resolved. Lowering the symmetry consistent with the morphological polar symmetry 6 was no remedy for the refinement.