ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H4N2O2/c8-5(9)4-3-6-1-2-7-4/h1-3H,(H,8,9)/file?format=sdf&get3d=True  -- InChI=1S/C5H4N2O2/c8-5(9)4-3-6-1-2-7-4/h1-3H,(H,8,9) could not be loaded.