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