InChI=1S/C21H28N2O6/c1-11(24)21(26)10-22-16-8-20(18-7-15(21)13(16)9-29-18)14-5-4-12(27-2)6-17(14)23(28-3)19(20)25/h4-6,11,13,15-16,18,22,24,26H,7-10H2,1-3H3/t11?,13-,15+,16-,18+,20-,21-/m0/s1