ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C3H2N2/c4-2-1-3-5/h1H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C3H2N2/c4-2-1-3-5/h1H2 could not be loaded.