ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2/N%3DC%5CC%28%5COc1cc%28ccc1%29C%29%3DC/N2/file?format=sdf&get3d=True  -- O%3DC2/N%3DC%5CC%28%5COc1cc%28ccc1%29C%29%3DC/N2 could not be loaded.