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