ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN4%5BC%40%40H%5D1CCC%5BC%40H%5D4C%5BC%40H%5D%28C1%29NC%28%3DO%29c3nn%28C%29c2ccccc23/file?format=sdf&get3d=True  -- CN4%5BC%40%40H%5D1CCC%5BC%40H%5D4C%5BC%40H%5D%28C1%29NC%28%3DO%29c3nn%28C%29c2ccccc23 could not be loaded.