ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28C%29c1cc%28C%29cc%28c1O%29C%28C%29%28C%29C/file?format=sdf&get3d=True -- CC%28C%29%28C%29c1cc%28C%29cc%28c1O%29C%28C%29%28C%29C could not be loaded.