    New chain ID            Original chain ID

8rkg-pdb-bundle1.pdb:
           L                         L
           A                         A
           M                         M
           B                         B
           N                         N
           C                         C
           O                         O
           D                         D
           P                         P
           E                         E
           Q                         Q
           F                         F
           R                         R
           G                         G
           S                         S
           H                         H
           I                         I
           J                         J
           K                         K
