ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C3H4N2O/c6-5-3-1-2-4-5/h1-3,6H/file?format=sdf&get3d=True  -- InChI=1S/C3H4N2O/c6-5-3-1-2-4-5/h1-3,6H could not be loaded.