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The title compound, C 28 H 30 N 2 OS 2 , was obtained by thio­nation of 3′,6′-bis­(diethyl­amino)-3 H -spiro­[isobenzofuran-1,9′-xan­thene]-3-one with 2,4-bis­( p -methoxy­phen­yl)-1,3-dithia­diphos­phetane disulfide (Lawesson’s reagent). The planes of the two benzene rings of the xanthene system are inclined at a dihedral angle of 17.4 (1)°, and the plane of the dithio­phthalide group and the planes through the two benzene rings of the xanthene system make dihedral angles of 80.2 (1) and 82.8 (1)°, respectively.

3′,6′-Bis(diethylamino)-3H-spiro[2-benzothiophene-1,9′-xanthene]-3-thione