ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BNa%2B%5D.Ic1c%28/N%3DC/N%28C%29C%29c%28I%29cc%28I%29c1CCC%28O%29%3DO/file?format=sdf&get3d=True  -- %5BNa%2B%5D.Ic1c%28/N%3DC/N%28C%29C%29c%28I%29cc%28I%29c1CCC%28O%29%3DO could not be loaded.