ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28C%28CCC%29N1CCCC1%29C2%3DCC%3DC%28C%29C%3DC2/file?format=sdf&get3d=True  -- O%3DC%28C%28CCC%29N1CCCC1%29C2%3DCC%3DC%28C%29C%3DC2 could not be loaded.