ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DC%28O%29C%28%3DC%28OC1%3DO%29C%28/CC%29%3DC/C%29CC%28CC%29CC/file?format=sdf&get3d=True  -- CCC1%3DC%28O%29C%28%3DC%28OC1%3DO%29C%28/CC%29%3DC/C%29CC%28CC%29CC could not be loaded.