ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNN2C%28%3DN1%29CC3%3DCC%3DCC%3DC3N%3DC2N4CCN%28CC4%29C/file?format=sdf&get3d=True  -- CC1%3DNN2C%28%3DN1%29CC3%3DCC%3DCC%3DC3N%3DC2N4CCN%28CC4%29C could not be loaded.