    New chain ID            Original chain ID

9qgn-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                        1A
           H                        1B
           I                        1C
           J                        1D
           K                        1E
           L                        1F
           M                        1G
           N                        1H
           O                        1I
           P                        1J
           Q                        1K
           R                        1L
           S                        2A
           T                        2B
           U                        2C
           V                        2D
           W                        2E
           X                        2F
