ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28C%28%26%2361%3BO%29N%29N1CCCC1%26%2361%3BO/file?format=sdf&get3d=True  -- CCC%28C%28%26%2361%3BO%29N%29N1CCCC1%26%2361%3BO could not be loaded.