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