ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28CCCC2%28C1CC%3DC%28C2C%3DO%29C%3DO%29C%29C/file?format=sdf&get3d=True  -- CC1%28CCCC2%28C1CC%3DC%28C2C%3DO%29C%3DO%29C%29C could not be loaded.