ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BK%2B%5D.O%3DC%28%5BO-%5D%29c1ccccc1O/file?format=sdf&get3d=True -- %5BK%2B%5D.O%3DC%28%5BO-%5D%29c1ccccc1O could not be loaded.