ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N1CCN%28C%28%3DO%29CCBr%29CC1%29CCBr/file?format=sdf&get3d=True -- O%3DC%28N1CCN%28C%28%3DO%29CCBr%29CC1%29CCBr could not be loaded.