    New chain ID            Original chain ID

9cl5-pdb-bundle1.pdb:
           A                        Ba
           B                        Aa
           C                        Ca
           D                        Da
           E                        Bb
           F                        Bc
           G                        Ab
           H                        Ac
           I                        Cb
           J                        Cc
           K                        Db
           L                        Dc
