ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28CC%29%28C%28%3DO%29OCC%29C%28%3DO%29OCC/file?format=sdf&get3d=True  -- CCC%28CC%29%28C%28%3DO%29OCC%29C%28%3DO%29OCC could not be loaded.