ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29C1CCC2%3DC%28O%29C%3DCC%3DC2C1/file?format=sdf&get3d=True  -- CCCN%28CCC%29C1CCC2%3DC%28O%29C%3DCC%3DC2C1 could not be loaded.