InChI=1S/C21H23NO8/c1-20(29)8-4-5-11(23)17(26)14(8)18(27)15-9(20)6-10-16(22(2)3)12(24)7-13(25)21(10,30)19(15)28/h4-5,9-10,15-16,23,26,29-30H,6-7H2,1-3H3/t9?,10?,15?,16?,20-,21-/m1/s1