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Figure 2 The crystal packing of (I). In this figure, a helical chain assembled along the a axis of (I) is shown on the left of the panel, while the N—H⋯π inter­action croos-linking the helical chains paralell to the b axis is displayed on the right. Hydrogen bonds are shown as dashed lines. [Symmetry codes: (a) (i) x, −y + [{3\over 2}], z − [{1\over 2}]; (ii) x + [{1\over 2}], y + [{1\over 2}], −z + [{3\over 2}]; (iii) x + [{1\over 2}], −y + 2, −z + 1; (iv) x + 1, −y + [{3\over 2}], z − [{1\over 2}]; (v) x − [{1\over 2}], −y + 1, −z + 1; (vi) x + [{1\over 2}], y − [{1\over 2}], −z + [{3\over 2}]; (b) (i) x, y + 1, z; (ii) −x + 1, −y + 1, −z + 1; (iii) −x, −y, −z + 1; (iv) −x + 1, −y, −z; (v) −x, −y + 1, −z + 1; (vi) x − 1, y, z; (vii) x − 1, y + 1, z + 1].

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ISSN: 2056-9890
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