ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DC%28O%29C%28%3DO%29C%28%3DC%28O%29C1%3DO%29O/file?format=sdf&get3d=True  -- OC1%3DC%28O%29C%28%3DO%29C%28%3DC%28O%29C1%3DO%29O could not be loaded.