ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCNC%28%3DO%29N1C%3DC%28C%28%3DO%29NC1%3DO%29F/file?format=sdf&get3d=True  -- CCCCCCNC%28%3DO%29N1C%3DC%28C%28%3DO%29NC1%3DO%29F could not be loaded.