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