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