    New chain ID            Original chain ID

7ogq-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                       CCC
           D                       AaA
           E                       AeA
           F                       AmA
           G                       ApA
           H                       AuA
           I                       AxA
           J                       ABA
           K                       BaB
           L                       BbB
           M                       BfB
