ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H6Cl2/c1-4%282-5%293-6/h1-3H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C4H6Cl2/c1-4%282-5%293-6/h1-3H2 could not be loaded.