InChI=1S/C27H20O15S/c28-16-4-1-14(7-17(16)29)9-23(26(33)34)40-25(32)6-3-13-2-5-20(22(8-13)42-43(36,37)38)39-24-11-15-10-18(30)19(31)12-21(15)41-27(24)35/h1-8,10-12,23,28-31H,9H2,(H,33,34)(H,36,37,38)/b6-3+