ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%28C%28%3DO%29O-%29C%28CC%28%3DO%29O-%29%28C%28%3DO%29O-%29O.NH4%20.Fe%203/file?format=sdf&get3d=True  -- C%28C%28%3DO%29O-%29C%28CC%28%3DO%29O-%29%28C%28%3DO%29O-%29O.NH4%20.Fe%203 could not be loaded.