ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28C%29O%5BYb%5D%28OC%28C%29%3DO%29OC%28%3DO%29C.O/file?format=sdf&get3d=True  -- O%3DC%28C%29O%5BYb%5D%28OC%28C%29%3DO%29OC%28%3DO%29C.O could not be loaded.