ERROR opening https://cactus.nci.nih.gov/chemical/structure/CH-1C%3DCC%3DC1.CH-1C%3DCC%3DC1.Rh%202/file?format=sdf&get3d=True  -- CH-1C%3DCC%3DC1.CH-1C%3DCC%3DC1.Rh%202 could not be loaded.