InChI=1S/C20H24O9S/c1-11-18(12-5-7-14(21)16(9-12)26-3)28-19(20(11,2)22)13-6-8-15(17(10-13)27-4)29-30(23,24)25/h5-11,18-19,21-22H,1-4H3,(H,23,24,25)