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Figure 1 . The asymmetric unit of (I), with atomic numbering indicated, together with selected atoms of neighbouring molecules connected by weak hydrogen bonds shown as dotted lines (see Table 1, symmetry operations are −x,1/2+y,1/2-z for O′, −x,-1/2+y,1/2-z for H1" and H32"). Displacement ellipsoids are shown at the 50% probability level with H atoms as spheres of arbitrary size. |