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