    New chain ID            Original chain ID

7ogz-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                       CCC
           D                       DDD
           E                       EEE
           F                       FFF
           G                       AaA
           H                       AeA
           I                       AgA
           J                       AiA
           K                       BaB
           L                       DaD
           M                       DbD
           N                       DcD
           O                       DeD
           P                       DhD
           Q                       DkD
           R                       EaE
