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Figure 2 The crystal structure of (I), projected along the c axis. The dashed lines indicate short intermolecular contacts with N⋯O, C⋯C and O⋯C distances less than 3.0, 3.2 and 3.0 Å, respectively. [Symmetry mode: (x) 1/2-x, 3/2-y, z; (xi) 1/2-x, 5/2-y, z] |