ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1%5CC%3DC2/C%28%3DC%5CC1%3DO%29N%28CC2O%29C/file?format=sdf&get3d=True  -- O%3DC1%5CC%3DC2/C%28%3DC%5CC1%3DO%29N%28CC2O%29C could not be loaded.