"Thioindigo" . . "DyStar, C.I. Vat Red 41, C.I. 73 300" . . . "Thioindigo" . . . "[2(2\u2032)E]-3H,3\u2032H-[2,2\u2032-Bi-1-benzothiophenylidene]-3,3\u2032-dione" . "thioindigo" . . .