    New chain ID            Original chain ID

8gwa-pdb-bundle1.pdb:
           1                         1
           3                         3
           2                         2
           D                         D
           B                         B
           A                         A
           a                         a
           4                         4
           6                         6
           5                         5
           E                         E
           F                         F
           C                         C
           c                         c
