InChI=1S/C21H21NO8/c1-7-8-4-5-9(23)17(26)13(8)18(27)14-12(7)19(28)15-16(22(2)3)10(24)6-11(25)21(15,30)20(14)29/h4-5,12,14-16,19,23,26,28,30H,1,6H2,2-3H3/t12?,14?,15?,16?,19?,21-/m0/s1