ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%3DC%28C%28%3DN1%29C%28F%29F%29C%28%3DO%29O/file?format=sdf&get3d=True  -- CN1C%3DC%28C%28%3DN1%29C%28F%29F%29C%28%3DO%29O could not be loaded.