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Figure 1 The view of the title molecules, showing the atom-numbering scheme and the displacement ellipsoids drawn at 50% probability level. The hydrogen atoms are shown as spheres of arbitrary radius. The major-occupied parts at the sites A and A′ correspond to the isomers (Ia) and (Ib) respectively. The disorder is also shown for both sites A and A′. Bonding in the minor-occupied part is presented with open solid lines. |