ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc2cc1ccccc1cc2%29C3NC%28%3DO%29CC3/file?format=sdf&get3d=True  -- O%3DC%28Nc2cc1ccccc1cc2%29C3NC%28%3DO%29CC3 could not be loaded.