(S)-2-[(S,E)-4-(4-Chloro-phen-yl)-1-nitro-but-3-en-2-yl]cyclo-hexa-none.

The title compound, C16H18ClNO3, was obtained by the organocatalytic asymmetric Michael addition of cyclo­hexa­none to 1-chloro-4-[(1E,3E)-4-nitro­buta-1,3-dien­yl]benzene. The double bond has an E configuration. The cyclo­hexa­none ring adopts a chair conformation. The conformation of the mol­ecule is stabilized by a weak intra­molecular C—H⋯O hydrogen bond.