ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%5CN%3DC/1%5CNC%28%3DN%5CC%28%3DN%5CCC%29%5CN1%29Cl/file?format=sdf&get3d=True  -- CC%5CN%3DC/1%5CNC%28%3DN%5CC%28%3DN%5CCC%29%5CN1%29Cl could not be loaded.