ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29C1%3DCC%3DC%28C%3DC1%29C%28%3DN%29C2%3DCC%3DC%28C%3DC2%29N%28C%29C.Cl/file?format=sdf&get3d=True -- CN%28C%29C1%3DCC%3DC%28C%3DC1%29C%28%3DN%29C2%3DCC%3DC%28C%3DC2%29N%28C%29C.Cl could not be loaded.