ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29C1%3DC%28Cl%29C%3DCC%28Cl%29%3DN1/file?format=sdf&get3d=True  -- O%3DC%28O%29C1%3DC%28Cl%29C%3DCC%28Cl%29%3DN1 could not be loaded.