ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28%3DO%29NC%28CC1%3DCC%3DC%28C%3DC1%29O%29C%28%3DO%29NCCCCNCCCNCCCN/file?format=sdf&get3d=True  -- CCCC%28%3DO%29NC%28CC1%3DCC%3DC%28C%3DC1%29O%29C%28%3DO%29NCCCCNCCCNCCCN could not be loaded.