InChI=1S/C12H16N2O4/c1-6-4-14(11(18)13-10(6)17)12-2-8(12)7(5-15)9(16)3-12/h4,7-9,15-16H,2-3,5H2,1H3,(H,13,17,18)/t7-,8-,9-,12-/m0/s1