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Figure 3 The three–dimentional structure of I. Dashed lines indicate hydrogen bonds. H atoms not involved in hydrogen bonding have been omitted for clarity. Symmetry codes: (i) −x + 1, −y, −z + 1; (ii) x + , −y + , z − ; (iii) −x, −y, −z + 1; (iv) x − , −y + , z − ). |