ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%5C1c2c%28O/C%28%3DC/1%29C%29cc%28O%29cc2C/file?format=sdf&get3d=True  -- O%3DC%5C1c2c%28O/C%28%3DC/1%29C%29cc%28O%29cc2C could not be loaded.