ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%26%2361%3BC1N%26%2361%3BC%28O%29N%28C%26%2361%3BC1%29C2OC%28CO%29C%28O%29C2/file?format=sdf&get3d=True -- N%26%2361%3BC1N%26%2361%3BC%28O%29N%28C%26%2361%3BC1%29C2OC%28CO%29C%28O%29C2 could not be loaded.