ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H14N2/c6-4-2-1-3-5-7/h1-7H2/file?format=sdf&get3d=True  -- InChI=1S/C5H14N2/c6-4-2-1-3-5-7/h1-7H2 could not be loaded.