InChI=1S/C14H14N4O3/c15-13(20)11(12(19)9-4-2-1-3-5-9)18-14(21)10-8-16-6-7-17-10/h1-8,11-12,19H,(H2,15,20)(H,18,21)/t11-,12?/m0/s1