ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%28%3DN%29C%3DCN%28C1%3DO%29C2C%28C%28C%28O2%29CO%29O%29O/file?format=sdf&get3d=True  -- CN1C%28%3DN%29C%3DCN%28C1%3DO%29C2C%28C%28C%28O2%29CO%29O%29O could not be loaded.