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