ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29%5BC%40H%5D1N%5CC%28%3DN/CC1%29C/file?format=sdf&get3d=True  -- O%3DC%28O%29%5BC%40H%5D1N%5CC%28%3DN/CC1%29C could not be loaded.