ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCCC1%28C2%3DC%28CO1%29C%3DC%28C%3DC2%29C/file?format=sdf&get3d=True -- CN%28C%29CCCC1%28C2%3DC%28CO1%29C%3DC%28C%3DC2%29C could not be loaded.