    New chain ID            Original chain ID

7k23-pdb-bundle1.pdb:
           A                        L2
           B                        H2
           C                         A
           D                         B
           E                         C
           F                         D
           G                         E
           H                        L3
           I                        H3
           J                        L4
           K                        H4
           L                        L5
           M                        H5
           N                        L6
           O                        H6
