ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29C%28%5CC%29%3DC%5CC1C%28C%29%3DCCCC1%28C%29C/file?format=sdf&get3d=True -- CC%28%3DO%29C%28%5CC%29%3DC%5CC1C%28C%29%3DCCCC1%28C%29C could not be loaded.