ERROR opening https://cactus.nci.nih.gov/chemical/structure/S%3DC1N%28%5CC%3DC/N1C%28%3DO%29OCC%29C/file?format=sdf&get3d=True  -- S%3DC1N%28%5CC%3DC/N1C%28%3DO%29OCC%29C could not be loaded.