    New chain ID            Original chain ID

8b6g-pdb-bundle1.pdb:
           A                        CH
           B                        CM
           C                        CL
           D                        CA
           E                        CI
           F                        CB
           G                        CF
           H                        CG
           I                        CK
           J                        CE
           K                        CJ
           L                        CN
           M                        CC
           N                        CO
           O                        CD
