ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%28%3DO%29%5BO-%5D.N%28%3DO%29%5BO-%5D.%5BBa%2B2%5D/file?format=sdf&get3d=True  -- N%28%3DO%29%5BO-%5D.N%28%3DO%29%5BO-%5D.%5BBa%2B2%5D could not be loaded.