ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28SC%3DN%201CC2%3DCN%3DC%28N%3DC2N%29C%29CCO/file?format=sdf&get3d=True  -- CC1%3DC%28SC%3DN%201CC2%3DCN%3DC%28N%3DC2N%29C%29CCO could not be loaded.