InChI=1/C15H20N2O4/c1-2-6-15(14(20)21)7-4-9-17(10-15)13(19)12-11(18)5-3-8-16-12/h3,5,8,18H,2,4,6-7,9-10H2,1H3,(H,20,21)/p-2/t15-/m1/s1/fC15H18N2O4/h18h/q-2 D091B3B100E424DD