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