InChI=1S/C11H14N2O5/c14-4-3-12-2-1-7-5-8(10(15)16)13-9(6-7)11(17)18/h1-2,5,9,13-14H,3-4,6H2,(H,15,16)(H,17,18)/b7-1-,12-2+/t9-/m0/s1