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Figure 3
Fragment of the extended structure of I with hydrogen bonds shown as dashed lines. Symmetry codes: (i) −x + 1, −y + 1, −z + 1; (ii) x + 1, y, z; (iii) −x + 1, y + [{1\over 2}], −z + [{1\over 2}]; (iv) x, −y + [{3\over 2}], −z + [{1\over 2}]. The packing for II is essentially identical.

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