    New chain ID            Original chain ID

7rmc-pdb-bundle1.pdb:
           V                         V
           D                         D
           E                         E
           F                         F
           g                         g
           Q                         Q
           S                         S
           U                         U
           h                         h
           R                         R
           T                         T

7rmc-pdb-bundle2.pdb:
           W                         W
