Crystal structure and Hirshfeld surface analysis of dimethyl (3a S ,6 R ,6a S ,7 S )-2-(2,2,2-tri-fluoro-acet-yl)-2,3-di-hydro-1 H ,6 H ,7 H -3a,6:7,9a-di-epoxy-benzo[ de ]iso-quinoline-3a 1 ,6a-di-carboxyl-ate.

The title mol-ecule, C18 H16 F3 NO7 , comprises a fused cyclic system containing four five-membered (two di-hydro-furan and two tetra-hydro-furan) rings and one six-membered (piperidine) ring. The five-membered di-hydro-furan and tetra-hydro-furan rings adopt envelope conformations, and the six-membered piperidine ring adopts a distorted chair conformation. Intra-molecular O ⋯ F inter-actions help to stabilize the conformational arrangement. In the crystal structure, mol-ecules are linked by weak C-H⋯O and C-H⋯F hydrogen bonds, forming a three-dimensional network. The Hirshfeld surface analysis confirms the dominant role of H⋯H contacts in establishing the packing.