Figure 3
Part of the three-dimensional hydrogen-bonding network in the needle crystals, viewed approximately parallel to a and showing one turn of the helix (starting from the molecule with symmetry code ii). Molecules labelled 1 and 2 are described in the Comment. [Symmetry codes: (i) x, y − 1, z; (ii) x − , −y + , −z + 1; (iii) x − , −y + , −z + 1; (iv) x + , −y + , −z + 1; (v) −x + 2, y − , −z + ; (vi) −x + , −y + 1, z + .] |