2-[(2Z)-Azepan-2-yl­idene]-1-(4-nitro­phen­yl)ethanone

The title compound, C₁₄H₁₆N₂O₃, is an NH-vinyl­ogous amide (enaminone) produced by the reaction of 4-nitro­phenacyl bromide with azepane-2-thione. The conformation about the C=C bond [1.3927 (14) Å] is Z, which allows for the formation of an intra­molecular N—H...O hydrogen bond that leads to an S(6) loop. Inversion-related mol­ecules associate via N—H...O hydrogen bonds to form a 12-membered {...OC₃NH}₂ synthon.