ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OCCc1ccccc1%29%5CC%3DC%5Cc2cc%28O%29c%28O%29cc2/file?format=sdf&get3d=True  -- O%3DC%28OCCc1ccccc1%29%5CC%3DC%5Cc2cc%28O%29c%28O%29cc2 could not be loaded.