ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCCCC1%3DC%28CCCCCCC%28%3DO%29O%29C1/file?format=sdf&get3d=True  -- CCCCCCCCC1%3DC%28CCCCCCC%28%3DO%29O%29C1 could not be loaded.