Figure 1
A fragment of the structure of the title compound with atom labelling scheme and 50% probability displacement ellipsoids. Symmetry code: (i) x + 1, y, z; (ii) -x + 1, y + , -z + 2; (iii) -x + 1, y - , -z + 2; (iv) -x + 1, y - , -z + 1; (v) -x, y - , -z + 1.