ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%26%2361%3B%26%2391%3BTh%26%2393%3B%26%2361%3BO/file?format=sdf&get3d=True  -- O%26%2361%3B%26%2391%3BTh%26%2393%3B%26%2361%3BO could not be loaded.