ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3D%5BNH%2B%5DC%3DC1%5CC%3DC/C%3DC%5CN1C/file?format=sdf&get3d=True  -- O%3D%5BNH%2B%5DC%3DC1%5CC%3DC/C%3DC%5CN1C could not be loaded.