1,2,7,8-Dibenzo-3,4,5,6-tetrahydrothioxanthylium perchlorate 5,6,8,9-Tetrahydrodibenzo(c,h)thioxanthylium perchlorate 65193-70-6 Dibenzo(c,h)thioxanthylium, 5,6,8,9-tetrahydro-, perchlorate