1,2,5-thiadiazole, 3,4-diphenoxy- 3,4-diphenoxy-1,2,5-thiadiazole InChI=1/C12H10N4O2S/c1-18-12(17)14-10-15-16-7-9(13-11(16)19-10)8-5-3-2-4-6-8/h2-7H,1H3,(H,14,15,17