InChI=1S/C20H22O11S/c21-10-16-19(31-32(26,27)28)17(24)18(25)20(30-16)29-15-8-12(7-14(23)9-15)2-1-11-3-5-13(22)6-4-11/h1-9,16-25H,10H2,(H,26,27,28)/b2-1-