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