ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29CCC1%3DC2CC%28%3DO%29NC2%3DCC%3DC1/file?format=sdf&get3d=True  -- CCCN%28CCC%29CCC1%3DC2CC%28%3DO%29NC2%3DCC%3DC1 could not be loaded.