ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C5H2N4/c6-1-4-5%282-7%299-3-8-4/h3H%2C%28H%2C8%2C9%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C5H2N4/c6-1-4-5%282-7%299-3-8-4/h3H%2C%28H%2C8%2C9%29 could not be loaded.