InChI=1S/C15H16O9S/c1-20-13-7-10(23-15(16)14(13)24-25(17,18)19)4-2-9-3-5-11-12(6-9)22-8-21-11/h2-6,10,13-14H,7-8H2,1H3,(H,17,18,19)/b4-2+