InChI=1S/C22H21O12/c1-31-15-4-8(2-3-11(15)23)19-13(25)7-10-12(24)5-9(6-14(10)33-19)32-22-18(28)16(26)17(27)20(34-22)21(29)30/h2-7,16-18,20,22-28H,1H3,(H,29,30)