ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC1%3DCC%28OC%29%3DC%28CCNCC2%3DC%28OC%29C%3DCC%3DC2%29C%3DC1OC/file?format=sdf&get3d=True  -- CCCC1%3DCC%28OC%29%3DC%28CCNCC2%3DC%28OC%29C%3DCC%3DC2%29C%3DC1OC could not be loaded.