ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28CCC1%3DCNC2%3DC1C%3DC%28SC%29C%3DC2%29C/file?format=sdf&get3d=True  -- CN%28CCC1%3DCNC2%3DC1C%3DC%28SC%29C%3DC2%29C could not be loaded.