ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BK%2B%5D.%5BO-%5D%20%5BMn%5D%28%3DO%29%28%3DO%29%3DO/file?format=sdf&get3d=True  -- %5BK%2B%5D.%5BO-%5D%20%5BMn%5D%28%3DO%29%28%3DO%29%3DO could not be loaded.