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Figure 2 Intermolecular contacts, viewed along [0 0 − 1]. Blue dashed lines indicate hydrogen bonds, yellow dashed lines indicate C–H⋯O contacts. Symmetry operators: i −x, −y + 1, −z + 1; ii x − , −y + , −z + 1; iii x + , −y + , −z + 1; iv −x, −y, −z + 1. |