4,9-Dithia-tricyclo[6.2.0.0*2,5*]deca-1(8),2(5),6-triene 4,9-dithiatricyclo[6.2.0.0~2,5~]deca-1,5,7-triene InChI=1/C8H6S2/c1-2-8-6(4-10-8)5-3-9-7(1)5/h1-2H,3-4H