ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1%28c%28c%28c%28c%28c1C%29C%29C%29C%29C%29C/file?format=sdf&get3d=True  -- c1%28c%28c%28c%28c%28c1C%29C%29C%29C%29C%29C could not be loaded.