ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28C%28%3DO%29c1ccc%28F%29c%28C%29c1%29N1CCCC1/file?format=sdf&get3d=True  -- CCCC%28C%28%3DO%29c1ccc%28F%29c%28C%29c1%29N1CCCC1 could not be loaded.