InChI=1S/C21H25NO8/c1-19(28)9-5-4-6-11(23)14(9)16(26)15-10(19)8-20(29)17(22(2)3)12(24)7-13(25)21(20,30)18(15)27/h4-6,10,12,15,17,23-24,28-30H,7-8H2,1-3H3/t10?,12?,15?,17?,19-,20?,21-/m1/s1