ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H6Cl2/c1-2-4(6)3-5/h2,4H,1,3H2/file?format=sdf&get3d=True  -- InChI=1S/C4H6Cl2/c1-2-4(6)3-5/h2,4H,1,3H2 could not be loaded.