ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1C%28/OC%29%3DC%5CC%28%3DO%29%5CC%3DC1%5COC/file?format=sdf&get3d=True  -- O%3DC1C%28/OC%29%3DC%5CC%28%3DO%29%5CC%3DC1%5COC could not be loaded.