ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28C%3DO%29C%28C%29%28C%29CC%3DC1/file?format=sdf&get3d=True  -- CC1%3DC%28C%3DO%29C%28C%29%28C%29CC%3DC1 could not be loaded.