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