    New chain ID            Original chain ID

6wou-pdb-bundle1.pdb:
           A                         A

6wou-pdb-bundle2.pdb:
           B                         B

6wou-pdb-bundle3.pdb:
           C                         C

6wou-pdb-bundle4.pdb:
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
