ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC1%3DCC%28OC%29%3DC%28CC%28C%29N%29C%3DC1OC/file?format=sdf&get3d=True  -- CCCCCC1%3DCC%28OC%29%3DC%28CC%28C%29N%29C%3DC1OC could not be loaded.