ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1%3DC%28O%29C%28%3DO%29c2c%28O%29cc%28O%29cc2C1%3DO/file?format=sdf&get3d=True  -- OC1%3DC%28O%29C%28%3DO%29c2c%28O%29cc%28O%29cc2C1%3DO could not be loaded.