InChI=1S/C21H20O12/c1-6-14(25)17(28)19(30)21(31-6)32-8-4-9(22)13-12(5-8)33-20(18(29)16(13)27)7-2-10(23)15(26)11(24)3-7/h2-6,14,17,19,21-26,28-30H,1H3