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