ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29C%28N%29CC%28%3DO%29c1cccc%28O%29c1N/file?format=sdf&get3d=True  -- O%3DC%28O%29C%28N%29CC%28%3DO%29c1cccc%28O%29c1N could not be loaded.