ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1ccccc1OC%5CC%3DC%29CC%28O%29CNC%28C%29C/file?format=sdf&get3d=True  -- O%28c1ccccc1OC%5CC%3DC%29CC%28O%29CNC%28C%29C could not be loaded.