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