ERROR opening https://cactus.nci.nih.gov/chemical/structure/NC%28CO%29C%28%3DO%29NNCC1%3DC%28O%29C%28O%29%3DC%28O%29C%3DC1/file?format=sdf&get3d=True  -- NC%28CO%29C%28%3DO%29NNCC1%3DC%28O%29C%28O%29%3DC%28O%29C%3DC1 could not be loaded.