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The title compound, C 24 H 18 N 2 O 4 S, crystallizes in the ortho-rhom-bic P 2 1 2 1 2 1 space group, indicating the existence of only one enanti-omer with an S 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. In addition, a short inter-molecular S⋯N contact of 3.250 (3) Å indicates an inter-action between the S atom and the π-system of the thia-zole ring.

Crystal structure of ethyl 2-methyl-5,10-dioxo-4-phenyl-5,10-dihydro-4H-11-thia-1,4a-diazabenzo[b]fluorene-3-carboxylate