ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DC%28NC%28%3DN1%29N%29C%28C%28CN%29Cl%29O/file?format=sdf&get3d=True  -- C1%3DC%28NC%28%3DN1%29N%29C%28C%28CN%29Cl%29O could not be loaded.