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