    New chain ID            Original chain ID

8w0g-pdb-bundle1.pdb:
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6
           7                         7
           A                         A
           B                         B
           C                         C
           D                         D

8w0g-pdb-bundle2.pdb:
           E                         E
           F                         F
