2H,6H-thiopyrano[1,2-a][1,3]dithiin-5-ium, 3,4,9,9a-tetrahydro- 3,4,9,9a-tetrahydro-2H,6H-thiopyrano[1,2-a][1,3]dithiin-5-ium InChI=1/C8H13S2/c1-2-6-10-7-3-5-9-8(10)4-1/h1-2,8H,3-7H2/q+