ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H18N4/c7-1-4-10%285-2-8%296-3-9/h1-9H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H18N4/c7-1-4-10%285-2-8%296-3-9/h1-9H2 could not be loaded.