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