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