ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1%28%5BN%2B%5D%28%3DO%29%5BO-%5D%29ccc%28O%29cc1/file?format=sdf&get3d=True  -- c1%28%5BN%2B%5D%28%3DO%29%5BO-%5D%29ccc%28O%29cc1 could not be loaded.