Crystal structure of ethyl 2-methyl-5,10-dioxo-4-phenyl-5,10-di-hydro-4-11-thia-1,4a-di-aza-benzo[]fluorene-3-carb-oxy-late.

The title compound, CHNOS, crystallizes in the ortho-rhom-bic 222 space group, indicating the existence of only one enanti-omer with an configuration of the chiral center in the crystal phase. The di-hydro-pyrimidine ring adopts a twist-boat conformation while the quinone ring is slightly non-planar. In the crystal, mol-ecules are linked by weak C-H⋯O and C-H⋯S hydrogen bonds and C-H⋯π inter-actions.