    New chain ID            Original chain ID

9fft-pdb-bundle1.pdb:
           D                         D
           E                         E
           B                         B
           A                         A
           C                         C
           F                         F
           a                         a
           b                         b
           G                         G
           c                         c
           H                         H
           d                         d
           e                         e
           I                         I
