ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C5H4N4/c1-4-5%288-2-6-1%299-3-7-4/h1-3H%2C%28H%2C6%2C7%2C8%2C9%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C5H4N4/c1-4-5%288-2-6-1%299-3-7-4/h1-3H%2C%28H%2C6%2C7%2C8%2C9%29 could not be loaded.