ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%5C1%5CC%3DC/C%28%3DO%29/C%3DC/1/file?format=sdf&get3d=True  -- O%3DC%5C1%5CC%3DC/C%28%3DO%29/C%3DC/1 could not be loaded.