ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29OC%28CC%28%3DO%29O-%29CN%20%28C%29%28C%29C/file?format=sdf&get3d=True  -- CC%28%3DO%29OC%28CC%28%3DO%29O-%29CN%20%28C%29%28C%29C could not be loaded.