    New chain ID            Original chain ID

8qv3-pdb-bundle1.pdb:
           A                         c
           B                         d
           C                         E
           D                         F
           E                        Sc
           F                        Sd
           G                        Ad
           H                        Ac
           I                        Bd
           J                        Bc
           K                        Uc
           L                        Ud
