Figure 6 The molecular configuration and atom-numbering scheme for the repeat unit of (III), with non-H atoms drawn as 40% probability displacement ellipsoids. [Symmetry codes: (i) −x, y − , −z + ; (ii) −x, y + , −z + ; (iii) −x + 1, y − , −z + ; (iv) −x + 1, −y, −z + 1; (v) x − 1, −y + , z − .]