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Figure 1 The molecular structure of the title compound, showing 30% probability displacement ellipsoids and the atom-numbering scheme. Atoms labelled with the suffixes 'A′, 'B′ and 'C′ are related by the symmetry operators (y − , −x + , −z + 9/4; −x, −y + ,z and −y + , x + , −z + 9/4) |