InChI=1S/C13H17N3O4/c14-9(6-8-4-2-1-3-5-8)12(18)16-10(13(19)20)7-11(15)17/h1-5,9-10H,6-7,14H2,(H2,15,17)(H,16,18)(H,19,20)/t9-,10-/m0/s1