InChI=1S/C20H28N2O9/c1-10(2)22(31-20-17(26)15(24)16(25)18(30-20)19(27)28)8-11(23)9-29-14-5-3-4-13-12(14)6-7-21-13/h3-7,10-11,15-18,20-21,23-26H,8-9H2,1-2H3,(H,27,28)/t11?,15-,16-,17+,18-,20?/m0/s1