InChI=1S/C20H20O12S/c21-11(7-6-10-4-2-1-3-5-10)15-12(22)8-13(23)19(17(15)25)31-20-18(26)16(24)14(9-30-20)32-33(27,28)29/h1-8,14,16,18,20,22-26H,9H2,(H,27,28,29)