Figure 1 The molecular structure of the title compound, showing one of the two independent molecules. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (A) x, 1/4-y, 1/4-z; (B) 1/4-x, y, 1/4-z; (C) 1/4-x, 1/4-y, z.]  [article HTML]