ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29C%28c3ccc2c1cc%28Cl%29ccc1nc2c3%29C/file?format=sdf&get3d=True  -- O%3DC%28O%29C%28c3ccc2c1cc%28Cl%29ccc1nc2c3%29C could not be loaded.