ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2N/N%3DC%28/c1ccc%28N/N%3DC%28%5CC%23N%29C%23N%29cc1%29%5BC%40H%5D%28C%29C2/file?format=sdf&get3d=True -- O%3DC2N/N%3DC%28/c1ccc%28N/N%3DC%28%5CC%23N%29C%23N%29cc1%29%5BC%40H%5D%28C%29C2 could not be loaded.