ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28CC/1%29%3DCCC1%3DC%28C%29/CC/C%3DC%28C%29/C/file?format=sdf&get3d=True  -- CC%28CC/1%29%3DCCC1%3DC%28C%29/CC/C%3DC%28C%29/C could not be loaded.