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