ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C5H6N2/c6-5-3-1-2-4-7-5/h1-4H%2C%28H2%2C6%2C7%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C5H6N2/c6-5-3-1-2-4-7-5/h1-4H%2C%28H2%2C6%2C7%29 could not be loaded.