ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1%5CC%3DC%28/CC%28C%29%28C%29C1%29C/file?format=sdf&get3d=True  -- O%3DC1%5CC%3DC%28/CC%28C%29%28C%29C1%29C could not be loaded.