InChI=1S/C21H22O9S/c1-10(2)5-6-13-12(4)19-17(8-16(13)23)29-20-14(9-28-31(25,26)27)15(22)7-11(3)18(20)21(24)30-19/h5,7-8,22-23H,6,9H2,1-4H3,(H,25,26,27)