InChI=1S/C20H18O9S/c1-10-3-4-12-18(27-9-10)8-17(26-2)13-7-16(28-19(12)13)11-5-14(21)20(15(22)6-11)29-30(23,24)25/h3,5-8,21-22H,4,9H2,1-2H3,(H,23,24,25)