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The title mol-ecule, C 18 H 16 F 3 NO 7 , 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.

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld surface analysis of dimethyl (3aS,6R,6aS,7S)-2-(2,2,2-trifluoroacetyl)-2,3-dihydro-1H,6H,7H-3a,6:7,9a-diepoxybenzo[de]isoquinoline-3a1,6a-dicarboxylate