Figure 4 Molecular packing viewed along the b axis. Colour coding as in Fig. 1(a). The 'Display Voids' tool in Mercury (Macrae et al., 2008), with a 1.2 Å probe radius and 0.4 Å grid spacing, has been used to highlight regions of disordered solvent accounting for about 11% of the unit cell volume.  [article HTML]