InChI=1S/C14H18N2O5/c15-10(6-7-12(17)18)13(19)16-11(14(20)21)8-9-4-2-1-3-5-9/h1-5,10-11H,6-8,15H2,(H,16,19)(H,17,18)(H,20,21)/t10-,11-/m0/s1