ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3DC%28C%23N%29C%28OC%28C%29CCCCCC%29%3DO/file?format=sdf&get3d=True  -- C%3DC%28C%23N%29C%28OC%28C%29CCCCCC%29%3DO could not be loaded.