ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C5H8Cl4/c6-4-2-1-3-5(7,8)9/h1-4H2/file?format=sdf&get3d=True  -- InChI=1S/C5H8Cl4/c6-4-2-1-3-5(7,8)9/h1-4H2 could not be loaded.