ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCCC%28%3DO%29CCC1%3DCC%28%3DC%28C%3DC1%29O%29OC/file?format=sdf&get3d=True  -- CCCCCCCC%28%3DO%29CCC1%3DCC%28%3DC%28C%3DC1%29O%29OC could not be loaded.