InChI=1S/C15H16N2O4/c1-3-8-6-10-14(19)16-12-9(15(20)17(10)7-8)4-5-11(21-2)13(12)18/h4-5,7,10,18H,3,6H2,1-2H3,(H,16,19)/t10-/m0/s1