ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BN%40H%5D%3DC%28N%29c3ccc%28c2cc1ccc%28cc1%5BnH%5D2%29C%28%3D%5BN%40H%5D%29N%29cc3/file?format=sdf&get3d=True -- %5BN%40H%5D%3DC%28N%29c3ccc%28c2cc1ccc%28cc1%5BnH%5D2%29C%28%3D%5BN%40H%5D%29N%29cc3 could not be loaded.