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