ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC2%3DC%28C%3DC1%29C%28CC%3DC2%29%28C%29C/file?format=sdf&get3d=True  -- CC1%3DCC2%3DC%28C%3DC1%29C%28CC%3DC2%29%28C%29C could not be loaded.