    New chain ID            Original chain ID

8qpe-pdb-bundle1.pdb:
           A                         4
           B                         5
           C                         6
           D                         7
           E                         C
           F                         D
           G                         I
           H                         K
           I                         M
           J                         U
           K                         X
           L                         r
           M                        z1
           N                        z2
           O                         J
           P                         L
           Q                         F
           R                         N
           S                         A
           T                         S
