InChI=1S/C13H16N2O5/c14-9(6-8-4-2-1-3-5-8)12(18)15-10(13(19)20)7-11(16)17/h1-5,9-10H,6-7,14H2,(H,15,18)(H,16,17)(H,19,20)/t9-,10-/m0/s1