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