ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCCCCCCCCCCC1%3DCC%28%3DCC%28%3DC1%29O%29O/file?format=sdf&get3d=True  -- CCCCCCCCCCCCCCCC1%3DCC%28%3DCC%28%3DC1%29O%29O could not be loaded.