ERROR opening https://cactus.nci.nih.gov/chemical/structure/c12c%28%5BnH%5Dcc1CCN%28C%29C%29cccc2OC%28%3DO%29C/file?format=sdf&get3d=True  -- c12c%28%5BnH%5Dcc1CCN%28C%29C%29cccc2OC%28%3DO%29C could not be loaded.