The crystal and molecular structure of a cybotactic nematic compound bis-(4′-n-butoxybenzal—chloro-1,4-phenylinediamine (BOCP in short) has been reported. The crystals belong to monoclinic system with space group P21/c,a= 36.693,b= 14.940,c= 6.1058 Å, β = 93.89° andZ= 4. The structure was determined by direct methods, with a finalR-value of 0.049 (Rw= 0.070) for 1979 observed reflections. The molecules are almost in their extended conformation. The molecules are inclined to theab-plane, the planar aromatic core region being almost parallel to theac-plane. Molecular packing in relation to the liquid crystal phase is discussed.