    New chain ID            Original chain ID

8r69-pdb-bundle1.pdb:
           T                         T
           V                         V
           U                         U
           W                         W
           A                         A
           B                         B
           E                         E
           G                         G
           N                         N
           n                         n
           S                         S
           s                         s
           C                         C
           D                         D
