ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H7N5/c1-2-7-3(5)9-4(6)8-2/h1H3,(H4,5,6,7,8,9)/file?format=sdf&get3d=True  -- InChI=1S/C4H7N5/c1-2-7-3(5)9-4(6)8-2/h1H3,(H4,5,6,7,8,9) could not be loaded.