Figure 2 A fragment of the packing diagram of the title compound, with displacement ellipsoids shown at the 50% probability level (H atoms, except H atoms attached to N1 atom, are omitted for clarity). Symmetry transformations used to generate equivalent atoms: (i) -x + 1, -y + 1, -z; (ii) x, -y + 1, z + [{1\over 2}]; (iii) -x + [{1\over 2}], y, -z + [{1\over 2}].  [article HTML]