ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c1ccc%28Br%29cc1%29c2cccc%28c2N%29CC%28%3DO%29O/file?format=sdf&get3d=True  -- O%3DC%28c1ccc%28Br%29cc1%29c2cccc%28c2N%29CC%28%3DO%29O could not be loaded.