ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%5BNH3%2B%5D.%5BO-%5Dn%28%3Ao%29%3Ao/file?format=sdf&get3d=True  -- CC%5BNH3%2B%5D.%5BO-%5Dn%28%3Ao%29%3Ao could not be loaded.