ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc%28nc%28c1%29Cl%29C%28Cl%29%28Cl%29Cl/file?format=sdf&get3d=True  -- c1cc%28nc%28c1%29Cl%29C%28Cl%29%28Cl%29Cl could not be loaded.