ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29C%28C%29%3DN%5BP%5D%28C%29%28F%29%3DO/file?format=sdf&get3d=True  -- CCN%28CC%29C%28C%29%3DN%5BP%5D%28C%29%28F%29%3DO could not be loaded.