ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29CC%28%3DO%29NC1%3DC%28C%29C%3DCC%3DC1C/file?format=sdf&get3d=True  -- CCN%28CC%29CC%28%3DO%29NC1%3DC%28C%29C%3DCC%3DC1C could not be loaded.