    New chain ID            Original chain ID

8twa-pdb-bundle1.pdb:
           C                         C
           P                         P
           T                         T
           E                         E
           D                         D
           B                         B
           4                         4
           3                         3
           2                         2
           5                         5
           1                         1
           X                         X
           Y                         Y
           Z                         Z
