(4aR,9R,9aR)-7-Bromo-9-nitro­methyl-2,3,4,4a,9,9a-hexa­hydro-1H-xanthen-1-one

The title compound, C(14)H(14)BrNO(4), contains a tricyclic ring system including three contiguous stereocenters all of which exhibit an R configuration. The cyclo­hexa­none ring adopts a chair conformation. The central oxane ring assumes a strained envelope conformation, with five of the ring atoms being nearly coplanar with the bromo­phenyl group and with the C atom adjacent to the O atom and fused with the cyclo­hexa­none ring as the flap. In the crystal, mol­ecules are linked into a three-dimensional network by C—H⋯O inter­actions.