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organic compounds
The structure of the title compound was determined by single-crystal X-ray methods. The carbonyl C=O bond distances are approximately 1.20 Å and van der Waals intermolecular contacts are normal. The bond distances are normal for all bonds in the molecule except for those involving C9: the C-F bond distance is 1.382 (6) Å, and the C-C bond distances are 1.545 (8), 1.531 (8) and 1.529 (9) Å, all approximately 0.05 Å longer than normal for these bonds.