InChI=1S/C20H22O11S/c21-12-5-2-10(3-6-12)1-4-11-7-13(22)8-14(23)16(11)20-19(26)18(25)17(24)15(31-20)9-30-32(27,28)29/h1-8,15,17-26H,9H2,(H,27,28,29)/b4-1-