ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1c%28OC%29cc/2c%28c1%29C/C%28%3DN%5CN%3DC%5C2c3ccc%28N%29cc3%29C%29C/file?format=sdf&get3d=True  -- O%28c1c%28OC%29cc/2c%28c1%29C/C%28%3DN%5CN%3DC%5C2c3ccc%28N%29cc3%29C%29C could not be loaded.