InChI=1S/C21H22O9S/c1-11(2)4-9-14-18(23)19(24)21(28-3)17-15(22)10-16(29-20(14)17)12-5-7-13(8-6-12)30-31(25,26)27/h4-8,16,23-24H,9-10H2,1-3H3,(H,25,26,27)