ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%20%28C%29%20%5BC%40%40H%5D3C%20%28%5CO%29%20%3DC%20%28%5CC%20%28N%29%20%3DO%29%20C%20%28%3DO%29%20%5BC%40%40%5D4%20%28O%29%20C%20%28/O%29%20%3DC2/C%20%28%3DO%29%20c1c%20%28cccc1O%29%20%5BC%40H%5D%28C%29%20%5BC%40H%5D2%5BC%40H%5D%28O%29%20%5BC%40%40H%5D34/file?format=sdf&get3d=True -- CN%20%28C%29%20%5BC%40%40H%5D3C%20%28%5CO%29%20%3DC%20%28%5CC%20%28N%29%20%3DO%29%20C%20%28%3DO%29%20%5BC%40%40%5D4%20%28O%29%20C%20%28/O%29%20%3DC2/C%20%28%3DO%29%20c1c%20%28cccc1O%29%20%5BC%40H%5D%28C%29%20%5BC%40H%5D2%5BC%40H%5D%28O%29%20%5BC%40%40H%5D34 could not be loaded.