InChI=1S/C21H30N2O6/c24-19(5-1-2-6-20(25)26)22-16(14-23-9-3-4-10-23)21(27)15-7-8-17-18(13-15)29-12-11-28-17/h7-8,13,16,21,27H,1-6,9-12,14H2,(H,22,24)(H,25,26)/t16-,21-/m1/s1