ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cl/C%28Cl%29%3DC%28%5CCl%29C%28%5CCl%29%3DC%28/Cl%29Cl/file?format=sdf&get3d=True  -- Cl/C%28Cl%29%3DC%28%5CCl%29C%28%5CCl%29%3DC%28/Cl%29Cl could not be loaded.