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Figure 2 Intermolecular contacts, viewed along [−1 0 0]. For reasons of clarity, only a selection of contacts is shown. Blue dashed lines illustrate classical hydrogen bonds of the N–H⋯O type, green dashed lines depict C–H⋯O contacts. Symmetry operators: i −x + 1, −y, −z + 1; ii x, −y + , z − . |