ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc1c%28C%29cccc1C%29C%28CC%29N%28CC%29CCC/file?format=sdf&get3d=True  -- O%3DC%28Nc1c%28C%29cccc1C%29C%28CC%29N%28CC%29CCC could not be loaded.