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