Rhodium-catalyzed [2+2+2] cyclo­addition of carbon di­sulfide too,N-dialkynyl­tosyl­anilines gives two isomeric indolo­thio­pyran­thio­nes as violet and red isomers. This is the first crystal structure of a red isomer, which crystallizes with one mol­ecule of di­chloro­methane in the asymmetric unit.