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Figure 2 The packing of the molecules viewed down the a axis. Dashed lines indicate hydrogen bonds. H atoms not involed in hydrogen bonds have been ommited for clarity. Symmetry codes: (i) x, y, z − 1; (ii) x, −y + 2, z − ; (iii) x + , −y + , z − ; (iv) x, y, z + 1. |