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