ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28NNCCC%28%3DO%29NCc1ccccc1%29c2ccncc2/file?format=sdf&get3d=True  -- O%3DC%28NNCCC%28%3DO%29NCc1ccccc1%29c2ccncc2 could not be loaded.