ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%5BC%40%40H%5D%28CC1%3DCN%3DCN1%29C%28N%5BC%40%40H%5D%28CCCCN%29C%28O%29%3DO%29%3DO%29CN/file?format=sdf&get3d=True  -- O%3DC%28N%5BC%40%40H%5D%28CC1%3DCN%3DCN1%29C%28N%5BC%40%40H%5D%28CCCCN%29C%28O%29%3DO%29%3DO%29CN could not be loaded.