ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C12H20N4O2/c17-11%2815-7-3-1-4-8-15%2913-14-12%2818%2916-9-5-2-6-10-16/h1-10H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C12H20N4O2/c17-11%2815-7-3-1-4-8-15%2913-14-12%2818%2916-9-5-2-6-10-16/h1-10H2 could not be loaded.