InChI=1S/C21H28N2O11/c1-21(2)18(29)13(25)11-10(34-21)4-3-8(12(11)23)9(24)5-7(22)6-32-20-16(28)14(26)15(27)17(33-20)19(30)31/h3-4,7,14-18,20,26-29H,5-6,22-23H2,1-2H3,(H,30,31)