ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29CCNC%28%3DO%29C1%3DCC%3DC%28C%3DC1%29NC%28%3DO%29C/file?format=sdf&get3d=True  -- CCN%28CC%29CCNC%28%3DO%29C1%3DCC%3DC%28C%3DC1%29NC%28%3DO%29C could not be loaded.