ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%23CN%3DC%28N%28C%29CC1%3DCN%3DC%28Cl%29C%3DC1%29C/file?format=sdf&get3d=True  -- N%23CN%3DC%28N%28C%29CC1%3DCN%3DC%28Cl%29C%3DC1%29C could not be loaded.