ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NCC%28O%29C1%3DCC%28Cl%29%3DC%28Cl%29C%3DC1/file?format=sdf&get3d=True  -- CC%28C%29NCC%28O%29C1%3DCC%28Cl%29%3DC%28Cl%29C%3DC1 could not be loaded.