ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2N1/C%28%3DC%28%5CCS%5BC%40%40H%5D1%5BC%40%40H%5D2NC%28%3DO%29Cc3ccccc3CN%29CSc4nnnn4CC%28%3DO%29O%29C%28%3DO%29O/file?format=sdf&get3d=True  -- O%3DC2N1/C%28%3DC%28%5CCS%5BC%40%40H%5D1%5BC%40%40H%5D2NC%28%3DO%29Cc3ccccc3CN%29CSc4nnnn4CC%28%3DO%29O%29C%28%3DO%29O could not be loaded.