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