ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C4H6Cl2/c5-3-1-2-4-6/h1-2H%2C3-4H2/b2-1%20/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C4H6Cl2/c5-3-1-2-4-6/h1-2H%2C3-4H2/b2-1%20 could not be loaded.