ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1/C%3DC%28%5CC%3DC%28/N1O%29C2CCCCC2%29C/file?format=sdf&get3d=True  -- O%3DC1/C%3DC%28%5CC%3DC%28/N1O%29C2CCCCC2%29C could not be loaded.