ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H16N2/c1-3-8%284-2%296-5-7/h3-7H2%2C1-2H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H16N2/c1-3-8%284-2%296-5-7/h3-7H2%2C1-2H3 could not be loaded.