InChI=1S/C16H20N2O5/c1-11(14(19)18-9-5-8-13(18)15(20)21)17-16(22)23-10-12-6-3-2-4-7-12/h2-4,6-7,11,13H,5,8-10H2,1H3,(H,17,22)(H,20,21)/t11-,13-/m0/s1