ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2cc%28O%29cc1c2%5BnH%5Dcc1CC%28N%29C/file?format=sdf&get3d=True  -- c2cc%28O%29cc1c2%5BnH%5Dcc1CC%28N%29C could not be loaded.