InChI=1S/C21H26O9S/c1-11-12(2)21(14-9-17(27-4)19(22)18(10-14)28-5)29-20(11)13-6-7-15(16(8-13)26-3)30-31(23,24)25/h6-12,20-22H,1-5H3,(H,23,24,25)