ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cc%5C2c%28%5CC%3DC/c1c%28cccc1%29C/2%3DC/CCN%28C%29C%29cc3/file?format=sdf&get3d=True  -- c3cc%5C2c%28%5CC%3DC/c1c%28cccc1%29C/2%3DC/CCN%28C%29C%29cc3 could not be loaded.