ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/CH6N2/c1-3-2/h3H%2C2H2%2C1H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/CH6N2/c1-3-2/h3H%2C2H2%2C1H3 could not be loaded.