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