ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1CN%3DC%28c2ccccn2%29c2cc%28Br%29ccc2N1/file?format=sdf&get3d=True  -- O%3DC1CN%3DC%28c2ccccn2%29c2cc%28Br%29ccc2N1 could not be loaded.