ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C3HN/c1-2-3-4/h1H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C3HN/c1-2-3-4/h1H could not be loaded.