InChI=1S/C21H20O11S/c1-29-15-8-12(23)16-11(22)7-14(10-5-3-2-4-6-10)31-19(16)17(15)20-21(32-33(26,27)28)18(25)13(24)9-30-20/h2-8,13,18,20-21,23-25H,9H2,1H3,(H,26,27,28)