3,3′-Dibenzoyl-1,1′-dibenzyl-1,1′-(ethane-1,2-di­yl)­dithio­urea

In the title compound, C(32)H(30)N(4)O(2)S(2), the carbonyl and thio­carbonyl groups are found in a rare synclinal conformation, with an S—C⋯C—O pseudo-torsion angle of 62.6 (2)°. The mol­ecule has C(i) = S (2) point-group symmetry with a crystallographic center of inversion located in the middle of the ethyl­ene bridge. One of the symmetry-independent phenyl rings is disordered over two orientations, with a site-occupation ratio of 70:30. The distances between the centroids of the nearest phenyl rings are equal to one of the lattice constants [a = 4.7767 (2) Å], so stacking inter­actions are extremely weak. Mol­ecules are joined by bifurcated hydrogen bonds (N—H⋯O and N—H⋯S), forming a ladder-like arrangement along [100]. van der Waals forces combine these ladders into a three-dimensional structure. The dependency between the S⋯O distance and the improper S=C⋯C=O torsion angle based on 739 structures containing the CC(=O)NC(=S)N moiety is discussed.