ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29CCN2C%28%3DN%29O%5CN%3DC2%5Cc1ccccc1/file?format=sdf&get3d=True -- CCN%28CC%29CCN2C%28%3DN%29O%5CN%3DC2%5Cc1ccccc1 could not be loaded.