ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H6N2O/c8-4-5-3-6-1-2-7-5/h1-3,8H,4H2/file?format=sdf&get3d=True  -- InChI=1S/C5H6N2O/c8-4-5-3-6-1-2-7-5/h1-3,8H,4H2 could not be loaded.