InChI=1S/C15H14O9S/c1-20-13-7-14(16)23-11(15(13)24-25(17,18)19)5-3-9-2-4-10-12(6-9)22-8-21-10/h2-7,11,15H,8H2,1H3,(H,17,18,19)/b5-3+