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Figure 2 . Eight molecules lying around an inversion centre and viewed along the c axis are coloured by symmetry equivalence. The H-bond cross-linkage framework is drawn in the front layer by dotted lines·Hydrogen atoms are omitted except for those participating in H-bonds. Symmetry codes: (i) −x+0.5, y+0.5,-z+0.5; (ii) −x+0.5, y-0.5, −z+0.5. |