ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C1C2CC%28%3DC%28N2C1%3DO%29C%28%3DO%29O%29SCCN%3DCN%29O/file?format=sdf&get3d=True  -- CC%28C1C2CC%28%3DC%28N2C1%3DO%29C%28%3DO%29O%29SCCN%3DCN%29O could not be loaded.