ERROR opening https://cactus.nci.nih.gov/chemical/structure/I%26%2391%3BIr%26%2393%3B%28I%29%28I%29I/file?format=sdf&get3d=True  -- I%26%2391%3BIr%26%2393%3B%28I%29%28I%29I could not be loaded.