ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCC%5BC%40H%5D1C%5BC%40H%5D1CCCCCCCCCC%28%3DO%29O/file?format=sdf&get3d=True  -- CCCCCC%5BC%40H%5D1C%5BC%40H%5D1CCCCCCCCCC%28%3DO%29O could not be loaded.