InChI=1S/C19H18O11S/c20-15(6-3-11-1-4-12(5-2-11)30-31(25,26)27)29-10-19(24)8-7-13-14(17(21)22)9-28-18(23)16(13)19/h1-9,13,16,18,23-24H,10H2,(H,21,22)(H,25,26,27)/b6-3+