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