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