3H-1,2,3,5-Dithiadiazol-3-yl,4-[3-(1,2,3,5-dithiadiazol-1-ium-4-yl)phenyl]-, compd. with4,4'-(1,3-phenylene)bis[1,2,3,5-dithiadiazol-1-ium] (1:1), trichloride