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