ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28O%29%28C%26%2361%3BC%29CCC%26%2361%3BC%28C%29C/file?format=sdf&get3d=True  -- CC%28O%29%28C%26%2361%3BC%29CCC%26%2361%3BC%28C%29C could not be loaded.