ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C3H6N2/c4-2-1-3-5/h1-2,4H2/file?format=sdf&get3d=True  -- InChI=1S/C3H6N2/c4-2-1-3-5/h1-2,4H2 could not be loaded.