InChI=1S/C21H20O12S/c22-8-14-20(33-34(28,29)30)18(26)19(27)21(32-14)16-11(24)7-13-15(17(16)25)10(23)6-12(31-13)9-4-2-1-3-5-9/h1-7,14,18-22,24-27H,8H2,(H,28,29,30)