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The title compound is a mono-thionated derivative of the diketopyrrolopyrrole red-pigment on the market. The crystal data are: C 18 H 12 N 2 OS,  M  r  = 304.37, monoclinic,  P 2 1 / n ,  a  = 7.570(3) Å,  b  = 4.869(3) Å,  c  = 19.616(4) Å,  β  = 99.07(3)°,  V  = 714.0(6) Å 3 ,  Z  = 2,  D  x  = 1.416,  D  m  = 1.372 Mg m −3 , graphite-monochromated Cu K α  ,  λ  = 1.5418 Å,  F (000) = 316.00,  μ  = 2.030 mm −1 ,  T  = 296 K,  R  = 0.073 for 890 reflections. The phenyl rings are twisted out of the planar heterocyclic system by about 6.3(7)°. The oxygen and sulfur atoms are not entirely on the plane of the heterocyclic system, but are located slightly below and above the plane by about 0.17(1) Å and 0.09(1) Å, respectively. The molecules are stacked alternately (upside down) in a herringbone fashion along the  b -axis.

Structure of 3,6-diphenylpyrrolo[3,4-c]pyrrole-1-on-4-thione