ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C2H6N2O/c1-2%285%294-3/h3H2%2C1H3%2C%28H%2C4%2C5%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C2H6N2O/c1-2%285%294-3/h3H2%2C1H3%2C%28H%2C4%2C5%29 could not be loaded.