InChI=1S/C21H20O13S/c1-31-19-14(20-21(34-35(28,29)30)15(25)11(24)7-32-20)18-13(16(26)17(19)27)10(23)6-12(33-18)8-2-4-9(22)5-3-8/h2-6,11,15,20-22,24-27H,7H2,1H3,(H,28,29,30)