ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1%28c%28nc%5BnH%5D1%29C%28N%29%3DO%29%5CN%3DN%5CN%28C%29C/file?format=sdf&get3d=True  -- c1%28c%28nc%5BnH%5D1%29C%28N%29%3DO%29%5CN%3DN%5CN%28C%29C could not be loaded.