ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29c1ccc%28O%29cc1%2C%20c1cc%28ccc1C%28%3DO%29O%29O/file?format=sdf&get3d=True  -- O%3DC%28O%29c1ccc%28O%29cc1%2C%20c1cc%28ccc1C%28%3DO%29O%29O could not be loaded.