Figure 2 Comparison of the asymmetric units for H2Mf2+·2Cl− (Xia, 2023; space group P21; top) and H2Mf2+·2Br− (this work; space group P21/c; bottom). The guanidine moiety in the cation and halides ions are shown using a spacefill representation (Macrae et al., 2020).