ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1C%28Cl%29%3DCC%28Cl%29%3DC%28Cl%29N1/file?format=sdf&get3d=True  -- O%3DC1C%28Cl%29%3DCC%28Cl%29%3DC%28Cl%29N1 could not be loaded.