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