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