InChI=1/C12H14O9S2/c13-10-3-1-8(6-10)5-9-2-4-11(20-22(14,15)16)12(7-9)21-23(17,18)19/h2,4,7-8H,1,3,5-6H2,(H,14,15,16)(H,17,18,19)/t8-/s2