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Figure 2 . Part of crystal structure of (I) viewed down the a axis and showing a two-dimensional network of molecules linked by several types of intermolecular N–H⋯O and C–H⋯O hydrogen bonds (dashed lines). Symmetry codes (i): −x + 1, y − , −z + ; (ii): x + 1, y, z + 1; (iii): −x, y − , −z + . |