(2S,3S)-3-(3-Bromophenyl)-6,6-dimethyl-2-nitro-2,3,6,7-tetrahydrobenzofuran-4(5H)-one

The title compound, C16H16BrNO4, has two adjacent chiral C atoms and both have an S configuration. The fused cyclohex-2enone and dihydrofuran rings both adopt envelope conformations, with the quaternary C atom and the nitro-substituted C atoms as the respective flap. The flap atoms lie 0.607 (3) and -0.253 (2) angstrom, respectively, from the mean plane of the remaining ring atoms on opposite sides. The dihedral angle between the mean plane of the four coplanar atoms of the dihydrofuran ring and the phenyl ring is 86.16 (3)degrees. In the crystal, molecules are linked by weak C-H center dot center dot center dot O interactions, forming a ladder motif parallel to the b axis.