ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC%28%3DO%29N%5BC%40%40H%5D1C%28%3DO%29O/file?format=sdf&get3d=True  -- C1CC%28%3DO%29N%5BC%40%40H%5D1C%28%3DO%29O could not be loaded.