    New chain ID            Original chain ID

8jiv-pdb-bundle1.pdb:
           A                        Aa
           B                        Ab
           C                        Ac
           D                        CA
           E                        CB
           F                        CC
           G                        CD
           H                        CE
           I                        CF
           J                        CG
           K                        CH
           L                        CI
           M                        CJ
           N                        CL
           O                        CM
           P                        CN
           Q                        CO
           R                        CP
           S                        CQ
           T                        CR
           U                        CS
           V                        CT

8jiv-pdb-bundle2.pdb:
           A                        CU
           B                        CV
           C                        CW
           D                        CX
           E                        CY
           F                        CZ
           G                        Ca
           H                        Cb
           I                        Cc
           J                        Cd
           K                        Ce
           L                        Cf
           M                        Cg
           N                        Ch
           O                        Ci
           P                        Cj
           Q                        Ck
           R                        Cl
           S                        Cm
           T                        Co
           U                        Cp
           V                        Cr
