ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC1%3DC%5CC%28%3DC/c2cccc3ccccc32%29c2ccccc21/file?format=sdf&get3d=True  -- CCCCCC1%3DC%5CC%28%3DC/c2cccc3ccccc32%29c2ccccc21 could not be loaded.