ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29C%28%3DO%29CNC1CCCC2%3DCC%3DCC%3DC12/file?format=sdf&get3d=True  -- CCN%28CC%29C%28%3DO%29CNC1CCCC2%3DCC%3DCC%3DC12 could not be loaded.