ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCC1%3DCC%28%3DC%28C%3DC1%29O%29O/file?format=sdf&get3d=True  -- CN%28C%29CCC1%3DCC%28%3DC%28C%3DC1%29O%29O could not be loaded.