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