InChI=1S/C20H22O11/c21-12(30-20-15(24)13(22)14(23)17(31-20)19(27)28)10-8-6-4-2-1-3-5-7-9-11-16(29-11)18(25)26/h1-11,13-17,20,22-24H,(H,25,26)(H,27,28)/b2-1-,5-3+,6-4+,9-7+,10-8-