ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BNH2%2B%5D%3DC%28N%29N%28C%29CC%28%5BO-%5D%29%3DO.html/file?format=sdf&get3d=True  -- %5BNH2%2B%5D%3DC%28N%29N%28C%29CC%28%5BO-%5D%29%3DO.html could not be loaded.