ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCC1%3DCNC2%3DCC%28%3DC%28C%3DC21%29Br%29Br/file?format=sdf&get3d=True  -- CN%28C%29CCC1%3DCNC2%3DCC%28%3DC%28C%3DC21%29Br%29Br could not be loaded.