InChI=1S/C21H20O11S/c1-21(2,25)16-7-12-14(30-16)8-15-11(18(12)29-3)6-10(20(24)31-15)9-4-5-13(22)19(17(9)23)32-33(26,27)28/h4-6,8,16,22-23,25H,7H2,1-3H3,(H,26,27,28)